The Housing Benefit (Implementation Subsidy) Order 1987

4.  The amount of subsidy payable to any authority which has not submitted an estimate of its implementation costs shall—

(a) if the proportionate assessment calculated for that authority is not more than £20,000, be calculated as an amount equal to the sum specified in column (2) of the Table in paragraph 3 above opposite paragraph (i) or (ii), as the case may be, of column (1);

(b) if the proportionate assessment calculated for that authority is more than £20,000, be calculated as an amount equal, subject to rounding down to the nearest £1,000—

(i) to the proportionate assessment, if it is not more than £50,000;

(ii) in any other case, to the aggregate of the sums arrived at by calculating in respect of each portion of that assessment specified in column (1) of the Table below the percentage specified opposite to it in column (2).

Table

(1)	(2)
Portion of the Proportionate Assessment	Percentage
The first £50,000	100%
Any excess over £50,000 not exceeding £75,000	80%
Any excess over £75,000 not exceeding £100,000	60%
Any excess over £100,000 not exceeding £150,000	40%
Any excess over £150,000 not exceeding £200,000	20%
Any excess over £200,000	10%