- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Pwynt Penodol mewn Amser (01/11/2008)
- Gwreiddiol (Fel y'i Deddfwyd)
Version Superseded: 01/04/2009
Point in time view as at 01/11/2008.
Taxes Management Act 1970, Cross Heading: Income tax and capital gains tax is up to date with all changes known to be in force on or before 30 December 2024. There are changes that may be brought into force at a future date. Changes that have been made appear in the content and are referenced with annotations.
Changes and effects yet to be applied by the editorial team are only applicable when viewing the latest version or prospective version of legislation. They are therefore not accessible when viewing legislation as at a specific point in time. To view the ‘Changes to Legislation’ information for this provision return to the latest version view using the options provided in the ‘What Version’ box above.
Textual Amendments
F1Pt. 5A inserted (with effect in accordance with s. 199(2)(3) of the amending Act) by Finance Act 1994 (c. 9), s. 192 (with s. 198(1)); S.I. 1998/3173, art. 2
F2S. 59A cross-heading inserted (with effect in accordance with s. 117(4)(5) of the amending Act) by Finance Act 1998 (c. 36), Sch. 19 para. 29(1); S.I. 1998/3173, art. 2
(1)[F3Subject to subsection (9) below,] this section applies to any person (the taxpayer) as regards a year of assessment if as regards the immediately preceding year—
(a)he [F4is assessed] to income tax under section 9 of this Act in any amount, and
(b)that amount (the assessed amount) exceeds the amount of any income tax which has been deducted at source, and
(c)the amount of the excess (the relevant amount) is not less than such amount as may be prescribed by regulations made by the Board, and
(d)the proportion which the relevant amount bears to the assessed amount is not less than such proportion as may be so prescribed.
(2)Subject to subsection (3) below, the taxpayer shall make two payments on account of his liability to income tax for the year of assessment—
(a)the first on or before the 31st January in that year, and
(b)the second on or before the next following 31st July;
and, subject to [F5subsections [F6(4) to (4B)]] below, each of those payments on account shall be of an amount equal to 50 per cent. of the relevant amount.
(3)If, at any time before the 31st January next following the year of assessment, the taxpayer makes a claim under this subsection stating—
(a)his belief that he will not be assessed to income tax for that year, or that the amount in which he will be so assessed will not exceed the amount of income tax deducted at source, and
(b)his grounds for that belief,
each of the payments on account shall not be, and shall be deemed never to have been, required to be made.
(4)If, at any time before the 31st January next following the year of assessment, the taxpayer makes a claim under this subsection stating—
(a)his belief that the amount in which he will be assessed to income tax for that year will exceed the amount of income tax deducted at source by a stated amount which is less than the relevant amount, and
(b)his grounds for that belief,
the amount of each of the payments on account required to be made shall be, and shall be deemed always to have been, equal to 50 per cent. of the stated amount.
[F7(4A)If as regards the year immediately preceding the year of assessment—
(a)the taxpayer is assessed to income tax under section 9 of this Act after the date on or before which either payment on account is required to be made, or
(b)his assessment to income tax under that section is amended after that date,
then, subject to subsections (3) and (4) above [F8and subsection (4B) below] and to any subsequent application of this subsection, the amount of the payment on account shall be, and shall be deemed always to have been, equal to 50 per cent. of the relevant amount as determined on the basis of the assessment or, as the case may be, the assessment as amended.]
[F9(4B)If as regards the year immediately preceding the year of assessment the taxpayer is assessed to income tax under section 29 of this Act in any amount, then, subject to subsections (3) and (4) above and to any subsequent application of this subsection, the amount of each payment on account shall be, and shall be deemed always to have been, the total of—
(a)the amount which, immediately before the making of the assessment under section 29, is the amount of that payment, and
(b)an amount equal to 50 per cent. of the amount in which he is assessed under that assessment;
and if that assessment is varied, the amount in which he is assessed under it shall be taken for the purposes of paragraph (b) above to be the amount of the assessment as varied.]
(5)Where the taxpayer makes a claim under subsection (3) or (4) above [F10or subsection (4A) [F11or (4B)] above applies], there shall be made all such adjustments, whether by the repayment of amounts paid on account[F12, by the making of payments or further payments on account] or otherwise, as may be required to give effect to the provisions of that subsection.
(6)Where the taxpayer fraudulently or negligently makes any incorrect statement in connection with a claim under subsection (3) or (4) above, he shall be liable to a penalty not exceeding the difference between—
(a)the amount which would have been payable on account if he had made a correct statement, and
(b)the amount of the payment on account (if any) made by him.
(7)The provisions of the Income Tax Acts as to the recovery of income tax shall apply to an amount falling to be paid on account of tax in the same manner as they apply to an amount of tax.
[F13(8)In this section, in relation to a year of assessment, any reference to the amount of any income tax deducted at source is a reference to the amount by which the aggregate of the following, namely—
(a)any income tax deducted or treated as deducted from any income, or treated as paid on any income, in respect of the year, and
(b)any amounts which, in respect of the year, are to be deducted at source under [F14PAYE regulations] in subsequent years, or are tax credits to which [F15section 397(1) [F16or 397A(2)] of ITTOIA 2005] applies,
exceeds the aggregate of any amounts which, in the year, are deducted at source under [F17PAYE regulations] in respect of previous years.
(9)If, at any time before the 31st January next following a year of assessment, an officer of the Board so directs—
(a)this section shall not apply, and shall be deemed never to have applied, as regards that year to any person specified in the direction; and
(b)there shall be made all such adjustments, whether by the repayment of amounts paid on account or otherwise, as may be required to give effect to the direction.]
[F18(10)[F19PAYE regulations] may provide that, for the purpose of determining the amount of any such excess as is mentioned in subsection (1) above, any necessary adjustments in respect of matters prescribed by the regulations shall be made to the amount of tax deducted at source under [F20PAYE regulations].]]
Textual Amendments
F3Words in s. 59A(1) inserted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 108(1)(a) (which amendment is saved (22.7.2004) by Finance Act 2004 (c. 12), Sch. 17 para. 6(1) (with Sch. 17 para. 6(2)))
F4Words in s. 59A(1)(a) substituted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 108(1)(b) (which amendment is saved (22.7.2004) by Finance Act 2004 (c. 12), Sch. 17 para. 6(1) (with Sch. 17 para. 6(2)))
F5Words in s. 59A(2) substituted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 108(2) (which amendment is saved (22.7.2004) by Finance Act 2004 (c. 12), Sch. 17 para. 6(1) (with Sch. 17 para. 6(2)))
F6Words in s. 59A(2) substituted (with effect in accordance with Sch. 18 para. 17 of the amending Act) by Finance Act 1996 (c. 8), Sch. 18 para. 2(2)
F7S. 59A(4A) inserted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 108(3) (which amendment is saved (22.7.2004) by Finance Act 2004 (c. 12), Sch. 17 para. 6(1) (with Sch. 17 para. 6(2)))
F8Words in s. 59A(4A) inserted (with effect in accordance with Sch. 18 para. 17 of the amending Act) by Finance Act 1996 (c. 8), Sch. 18 para. 2(3)
F9S. 59A(4B) inserted (with effect in accordance with Sch. 18 para. 17 of the amending Act) by Finance Act 1996 (c. 8), Sch. 18 para. 2(4)
F10Words in s. 59A(5) inserted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 108(4)(a) (which amendment is saved (22.7.2004) by Finance Act 2004 (c. 12), Sch. 17 para. 6(1) (with Sch. 17 para. 6(2)))
F11Words in s. 59A(5) inserted (with effect in accordance with Sch. 18 para. 17 of the amending Act) by Finance Act 1996 (c. 8), Sch. 18 para. 2(5)
F12Words in s. 59A(5) inserted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 108(4)(b) (which amendment is saved (22.7.2004) by Finance Act 2004 (c. 12), Sch. 17 para. 6(1) (with Sch. 17 para. 6(2)))
F13S. 59A(8)(9) substituted for s. 59A(8) (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 108(5) (which amendment is saved (22.7.2004) by Finance Act 2004 (c. 12), Sch. 17 para. 6(1) (with Sch. 17 para. 6(2)))
F14Words in s. 59A(8)(b) substituted (with effect in accordance with s. 723(1)(a)(b) of the amending Act) by Income Tax (Earnings and Pensions) Act 2003 (c. 1), Sch. 6 para. 130(a) (with Sch. 7)
F15Words in s. 59A(8)(b) substituted (with effect in accordance with s. 883(1) of the amending Act) by Income Tax (Trading and Other Income) Act 2005 (c. 5), s. 883(1), Sch. 1 para. 376 (with Sch. 2)
F16Words in s. 59A(8)(b) inserted (with effect in accordance with s. 34(2) of the amending Act) by Finance Act 2008 (c. 9), Sch. 12 para. 13
F17Words in s. 59A(8) substituted (10.7.2003) by Finance Act 2003 (c. 14), s. 145(7)(a)
F18S. 59A(10) inserted (with effect in accordance with s. 121(8) of the amending Act) by Finance Act 1996 (c. 8), s. 126(1)
F19Words in s. 59A(10) substituted (with effect in accordance with s. 723(1)(a)(b) of the amending Act) by Income Tax (Earnings and Pensions) Act 2003 (c. 1), Sch. 6 para. 130(b) (with Sch. 7)
F20Words in s. 59A(10) substituted (10.7.2003) by Finance Act 2003 (c. 14), s. 145(7)(b)
Modifications etc. (not altering text)
C1S. 59A modified (as respects the year 1996-97) by Finance Act 1995 (c. 4), Sch. 21 para. 2
C2S. 59A applied (with modifications) (with effect in accordance with reg. 1(2) of the amending S.I.) by The Taxation of Income from Land (Non-residents) Regulations 1995 (S.I. 1995/2902), regs. 1(1), 20, 21
C3S. 59A modified (22.7.2004) by Finance Act 2004 (c. 12), s. 108(3)
C4S. 59A: power to modify conferred (with effect in accordance with s. 1034(1) of the amending Act) by Income Tax Act 2007 (c. 3), ss. 972(4), 1034(1) (with Sch. 2)
(1)Subject to subsection (2) below, the difference between—
(a)the amount of income tax and capital gains tax contained in a person’s self-assessment under section 9 of this Act for any year of assessment, and
(b)the aggregate of any payments on account made by him in respect of that year (whether under section 59A of this Act or otherwise) and any income tax which in respect of that year has been deducted at source,
shall be payable by him or (as the case may be) repayable to him as mentioned in subsection (3) or (4) below [F22but nothing in this subsection shall require the repayment of any income tax treated as deducted or paid by virtue of section F23... 246D(1) F23... [F24of the principal Act[F25, section 626 of ITEPA 2003 or section 399(2), 400(2), 414(1), 421(1) or 530(1) of ITTOIA 2005]]].
(2)The following, namely—
(a)any amount which, in the year of assessment, is deducted at source under [F26PAYE regulations] in respect of a previous year, and
(b)any amount which, in respect of the year of assessment, is to be deducted at source under [F27PAYE regulations] in a subsequent year, or is a tax credit to which [F28section 397(1) [F29or 397A(2)] of ITTOIA 2005] applies,
shall be respectively deducted from and added to the aggregate mentioned in subsection (1)(b) above.
(3)In a case where the person—
(a)gave the notice required by section 7 of this Act within six months from the end of the year of assessment, but
(b)was not given notice under section 8 or 8A of this Act until after the 31st October next following that year,
the difference shall be payable or repayable at the end of the period of three months beginning with the day on which the notice under section 8 or 8A was given.
(4)In any other case, the difference shall be payable or repayable on or before the 31st January next following the year of assessment.
[F30(4A)Where in the case of a repayment the return on the basis of which the person’s self-assessment was made under section 9 of this Act is enquired into by an officer of the Board—
(a)nothing in subsection (3) or (4) above shall require the repayment to be made before the day on which, by virtue of section [F3128A(1)] of this Act, [F32the enquiry is] completed; but
(b)the officer may at any time before that day make the repayment, on a provisional basis, to such extent as he thinks fit.]
[F33(5)An amount of tax which is payable or repayable as a result of the amendment or correction of a self-assessment under—
(a)section 9ZA, 9ZB, 9C or 28A of this Act (amendment or correction of return under section 8 or 8A of this Act), or
(b)section 12ABA(3)(a), 12ABB(6)(a), 28B(4)(a), 30B(2)(a), 33A(4)(a) or 50(9)(a) of this Act (amendment of partner’s return to give effect to amendment or correction of partnership return),
is payable (or repayable) on or before the day specified by the relevant provision of Schedule 3ZA to this Act.]
[F34(5A)Where a determination under section 28C of this Act which has effect as a person’s self-assessment is superseded by his self-assessment under section 9 of this Act, any amount of tax which is payable or repayable by virtue of the supersession shall be payable or (as the case may be) repayable on or before the day given by subsection (3) or (4) above.]
(6)Any amount of income tax or capital gains tax which is payable by virtue of an assessment made [F35otherwise than under section 9 of this Act shall, unless otherwise provided,] be payable on the day following the end of the period of 30 days beginning with the day on which the notice of assessment is given.
(7)In this section any reference to income tax deducted at source is a reference to income tax deducted or treated as deducted from any income or treated as paid on any income.
[F36(8)[F37PAYE regulations] may provide that, for the purpose of determining the amount of the difference mentioned in subsection (1) above, any necessary adjustments in respect of matters prescribed by the regulations shall be made to the amount of tax deducted at source under [F38PAYE regulations].]]
Textual Amendments
F21S. 59B inserted (with effect in accordance with s. 199(2)(3) of the amending Act) by Finance Act 1994 (c. 9), s. 193 (with s. 198(3)); S.I. 1998/3173, art. 2
F22Words in s. 59B(1) inserted (with effect in accordance with s. 121(8) of the amending Act) by Finance Act 1996 (c. 8), s. 122(2)
F23Words in s. 59B(1) repealed (with effect in accordance with s. 883(1) of the amending Act) by Income Tax (Trading and Other Income) Act 2005 (c. 5), s. 883(1), Sch. 1 para. 377(2)(a), Sch. 3 (with Sch. 2)
F24Words in s. 59B(1) substituted (with effect in accordance with s. 723(1)(a)(b) of the amending Act) by Income Tax (Earnings and Pensions) Act 2003 (c. 1), Sch. 6 para. 131(2) (with Sch. 7)
F25Words in s. 59B(1) substituted (with effect in accordance with s. 883(1) of the amending Act) by Income Tax (Trading and Other Income) Act 2005 (c. 5), s. 883(1), Sch. 1 para. 377(2)(b) (with Sch. 2)
F26Words in s. 59B(2)(a) substituted (with effect in accordance with s. 723(1)(a)(b) of the amending Act) by Income Tax (Earnings and Pensions) Act 2003 (c. 1), Sch. 6 para. 131(3) (with Sch. 7)
F27Words in s. 59B(2) substituted (10.7.2003) by Finance Act 2003 (c. 14), s. 145(7)(b)
F28Words in s. 59B(2)(b) substituted (with effect in accordance with s. 883(1) of the amending Act) by Income Tax (Trading and Other Income) Act 2005 (c. 5), s. 883(1), Sch. 1 para. 377(3) (with Sch. 2)
F29Words in s. 59B(2)(b) inserted (with effect in accordance with s. 34(2) of the amending Act) by Finance Act 2008 (c. 9), Sch. 12 para. 14
F30S. 59B(4A) inserted (with effect in accordance with s. 121(8) of the amending Act) by Finance Act 1996 (c. 8), s. 127
F31Word in s. 59B(4A)(a) substituted (with effect and application in accordance with s. 88(3), Sch. 29 para. 16 of the amending Act) by Finance Act 2001 (c. 9), Sch. 29 para. 14(2)(a)
F32Words in s. 59B(4A)(a) substituted (with effect and application in accordance with s. 88(3), Sch. 29 para. 16 of the amending Act) by Finance Act 2001 (c. 9), Sch. 29 para. 14(2)(b)
F33S. 59B(5) substituted (with effect and application in accordance with s. 88(3), Sch. 29 para. 16 of the amending Act) by Finance Act 2001 (c. 9), Sch. 29 para. 14(3)
F34S. 59B(5A) inserted (with effect in accordance with s. 121(8) of the amending Act) by Finance Act 1996 (c. 8), s. 125(4)
F35Words in s. 59B(6) substituted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 115(6)
F36S. 59B(8) inserted (with effect in accordance with s. 121(8) of the amending Act) by Finance Act 1996 (c. 8), s. 126(2)
F37Words in s. 59B(8) substituted (with effect in accordance with s. 723(1)(a)(b) of the amending Act) by Income Tax (Earnings and Pensions) Act 2003 (c. 1), Sch. 6 para. 131(4) (with Sch. 7)
F38Words in s. 59B(8) substituted (10.7.2003) by Finance Act 2003 (c. 14), s. 145(7)(b)
Modifications etc. (not altering text)
C5S. 59B modified (with application in accordance with Sch. 21 para. 3(1) of the amending Act) by Finance Act 1995 (c. 4), Sch. 21 para. 3(3)
C6S. 59B applied (with modifications) (E.W.) (1.4.2000) by Education (Student Loans) (Repayment) Regulations 2000 (S.I. 2000/944), regs. 1(1), 21
C7S. 59B applied (with modifications) (N.I.) (1.4.2000) by The Education (Student Loans) (Repayment) Regulations (Northern Ireland) 2000 (S.R. 2000/121), regs. 1, 21
C8S. 59B modified (22.7.2004) by Finance Act 2004 (c. 12), s. 108(3)
C9S. 59B modified (22.7.2004) by Finance Act 2004 (c. 12), s. 109(4)
(1)This section applies in relation to any income tax or capital gains tax which has become payable by a person (the taxpayer) in accordance with section 55 or 59B of this Act.
(2)Where any of the tax remains unpaid on the day following the expiry of 28 days from the due date, the taxpayer shall be liable to a surcharge equal to 5 per cent. of the unpaid tax.
(3)Where any of the tax remains unpaid on the day following the expiry of 6 months from the due date, the taxpayer shall be liable to a further surcharge equal to 5 per cent. of the unpaid tax.
(4)Where the taxpayer has incurred a penalty under section 7, 93(5)[F40, 95 or 95A] of this Act, no part of the tax by reference to which that penalty was determined shall be regarded as unpaid for the purposes of subsection (2) or (3) above.
(5)An officer of the Board may impose a surcharge under subsection (2) or (3) above; and notice of the imposition of such a surcharge—
(a)shall be served on the taxpayer, and
(b)shall state the day on which it is issued and the time within which an appeal against the imposition of the surcharge may be brought.
(6)A surcharge imposed under subsection (2) or (3) above shall carry interest at the rate applicable under section 178 of the Finance Act 1989 from the end of the period of 30 days beginning with the day on which the surcharge is imposed until payment.
(7)An appeal may be brought against the imposition of a surcharge under subsection (2) or (3) above within the period of 30 days beginning with the date on which the surcharge is imposed.
(8)Subject to subsection (9) below, the provisions of this Act relating to appeals shall have effect in relation to an appeal under subsection (7) above as they have effect in relation to an appeal against an assessment to tax.
(9)On an appeal under subsection (7) above section 50(6) to (8) of this Act shall not apply but the Commissioners may—
(a)if it appears to them that, throughout the period of default, the taxpayer had a reasonable excuse for not paying the tax, set aside the imposition of the surcharge; or
(b)if it does not so appear to them, confirm the imposition of the surcharge.
(10)Inability to pay the tax shall not be regarded as a reasonable excuse for the purposes of subsection (9) above.
(11)The Board may in their discretion—
(a)mitigate any surcharge under subsection (2) or (3) above, or
(b)stay or compound any proceedings for the recovery of any such surcharge,
and may also, after judgment, further mitigate or entirely remit the surcharge.
(12)In this section—
“the due date”, in relation to any tax, means the date on which the tax becomes due and payable;
“the period of default”, in relation to any tax which remained unpaid after the due date, means the period beginning with that date and ending with the day before that on which the tax was paid.]
Textual Amendments
F39S. 59C inserted (with effect in accordance with s. 199(2)(3) of the amending Act) by Finance Act 1994 (c. 9), s. 194; S.I. 1998/3173, art. 2
F40Words in s. 59C(4) substituted (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 109(1)
Modifications etc. (not altering text)
C10S. 59C extended (with effect in accordance with s. 103(7) of the amending Act) by Finance Act 1995 (c. 4), s. 109(2)
C11S. 59C applied (E.W.) (1.4.2000) by Education (Student Loans) (Repayment) Regulations 2000 (S.I. 2000/944), regs. 1(1), 22
C12S. 59C applied (N.I.) (1.4.2000) by The Education (Student Loans) (Repayment) Regulations (Northern Ireland) 2000 (S.R. 2000/121), regs. 1, 22
The Whole Act you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
The Whole Act you have selected contains over 200 provisions and might take some time to download.
Would you like to continue?
The Whole Act without Schedules you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
The Whole Act without Schedules you have selected contains over 200 provisions and might take some time to download.
Would you like to continue?
Y Ddeddf Gyfan you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
Y Ddeddf Gyfan heb Atodlenni you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
Y Diweddaraf sydd Ar Gael (diwygiedig):Y fersiwn ddiweddaraf sydd ar gael o’r ddeddfwriaeth yn cynnwys newidiadau a wnaed gan ddeddfwriaeth ddilynol ac wedi eu gweithredu gan ein tîm golygyddol. Gellir gweld y newidiadau nad ydym wedi eu gweithredu i’r testun eto yn yr ardal ‘Newidiadau i Ddeddfwriaeth’.
Gwreiddiol (Fel y’i Deddfwyd neu y’i Gwnaed): Mae'r wreiddiol fersiwn y ddeddfwriaeth fel ag yr oedd pan gafodd ei deddfu neu eu gwneud. Ni wnaed unrhyw newidiadau i’r testun.
Pwynt Penodol mewn Amser: This becomes available after navigating to view revised legislation as it stood at a certain point in time via Advanced Features > Show Timeline of Changes or via a point in time advanced search.
Rhychwant ddaearyddol: Indicates the geographical area that this provision applies to. For further information see ‘Frequently Asked Questions’.
Dangos Llinell Amser Newidiadau: See how this legislation has or could change over time. Turning this feature on will show extra navigation options to go to these specific points in time. Return to the latest available version by using the controls above in the What Version box.
Gallwch wneud defnydd o ddogfennau atodol hanfodol a gwybodaeth ar gyfer yr eitem ddeddfwriaeth o’r tab hwn. Yn ddibynnol ar yr eitem ddeddfwriaeth sydd i’w gweld, gallai hyn gynnwys:
This timeline shows the different points in time where a change occurred. The dates will coincide with the earliest date on which the change (e.g an insertion, a repeal or a substitution) that was applied came into force. The first date in the timeline will usually be the earliest date when the provision came into force. In some cases the first date is 01/02/1991 (or for Northern Ireland legislation 01/01/2006). This date is our basedate. No versions before this date are available. For further information see the Editorial Practice Guide and Glossary under Help.
Defnyddiwch y ddewislen hon i agor dogfennau hanfodol sy’n cyd-fynd â’r ddeddfwriaeth a gwybodaeth am yr eitem hon o ddeddfwriaeth. Gan ddibynnu ar yr eitem o ddeddfwriaeth sy’n cael ei gweld gall hyn gynnwys:
liciwch ‘Gweld Mwy’ neu ddewis ‘Rhagor o Adnoddau’ am wybodaeth ychwanegol gan gynnwys