IHT Interest Series
The IHT Interest Series carries 6 published figures read from 2 sources' own pages; the 4 published figures given by rate run from 0.50 to 7.75 percent, read 17 October 2026.
2 of the 7 named sources read in full publish a figure; 5 publish none, read 17 October 2026.
By rate and spread over Bank Rate
| Breakdown | Median | Range | Sources |
|---|---|---|---|
| rateBank of England Bank Rate | 3.75% | 3.75 to 3.75% | 1 |
| raterepayment interest minimum floor | 0.5% | 0.5 to 0.5% | 1 |
| ratelate payment interest | 7.75% | 7.75 to 7.75% | 1 |
| raterepayment interest | 2.75% | 2.75 to 2.75% | 1 |
| spread over Bank Ratelate payment interest, base rate plus | 4% | 4 to 4% | 1 |
| spread over Bank Raterepayment interest, base rate minus | 1% | 1 to 1% | 1 |
Every figure, with its source
One row per published figure: the figure as the source's own page publishes it, the page, and the day it was read. A figure that is not on a page we read is not on this one.
| Source | Figure | Breakdown | Read |
|---|---|---|---|
| GOV.UK: rates and allowances - HMRC interest rates for late and early payments | 7.75% | late payment interest | 2026-10-17 |
| GOV.UK: rates and allowances - HMRC interest rates for late and early payments | 4% | late payment interest, base rate plus | 2026-10-17 |
| Bank of England: the interest rate (Bank Rate) | 3.75% | Bank of England Bank Rate | 2026-10-16 |
| GOV.UK: rates and allowances - HMRC interest rates for late and early payments | 2.75% | repayment interest | 2026-10-17 |
| GOV.UK: rates and allowances - HMRC interest rates for late and early payments | 1% | repayment interest, base rate minus | 2026-10-17 |
| GOV.UK: rates and allowances - HMRC interest rates for late and early payments | 0.5% | repayment interest minimum floor | 2026-10-17 |
The sentence each figure was read from (6)
- GOV.UK: rates and allowances - HMRC interest rates for late and early payments, read 2026-10-17:
late payment interest rate — 7.75% from 9 January 2026
- GOV.UK: rates and allowances - HMRC interest rates for late and early payments, read 2026-10-17:
late payment interest set at base rate plus 4% from 6 April 2025 (was plus 2.5% on or before 5 April 2025)
- Bank of England: the interest rate (Bank Rate), read 2026-10-16:
Today, we’ve held Bank Rate at 3.75%.
- GOV.UK: rates and allowances - HMRC interest rates for late and early payments, read 2026-10-17:
repayment interest rate — 2.75% from 9 January 2026
- GOV.UK: rates and allowances - HMRC interest rates for late and early payments, read 2026-10-17:
repayment interest, set at base rate minus 1%, with a lower limit of 0.5% (known as the ‘minimum floor’)
- GOV.UK: rates and allowances - HMRC interest rates for late and early payments, read 2026-10-17:
Repayment interest will be paid at 0.5% until the Bank of England raises the base rate above 1.5%.
Read in full, publishes no figure
5 named sources were read in full on the dates shown and print no usable figure. They are counted, never filled in.
- GOV.UK: HMRC interest rates for late and early payments (publication), read 2026-10-10: read in full and no accepted figure on the page
- GOV.UK: Rates and allowances - Inheritance Tax thresholds and interest rates, read 2026-10-10: read in full and no accepted figure on the page
- Bank of England Bank Rate database, read 2026-10-10: read in full and no accepted figure on the page
- IHTA 1984 s.233: interest on unpaid tax, read 2026-10-17: read in full and no accepted figure on the page
- GOV.UK: Inheritance Tax payment deadlines, read 2026-09-12: read in full and no accepted figure on the page
Methodology
Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2).
2 of the 7 named sources that could be read published a usable figure; 5 published none and are recorded as not published, never filled in; 0 could not be read (blocked, dead or unreachable) and count nowhere.
The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source for each breakdown it prices, in % (a source's median where its page yielded several accepted sentences for one breakdown), so a page that gives figures for several breakdowns gives one for each and N counts 6 figures, never sentences; 29 candidate sentence(s) were refused by a reviewer with the reason recorded.
The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): the full dated HMRC IHT interest series joined to the Bank of England Bank Rate on the same dates, so interest over any period between a death and a payment is computed rate-segment by rate-segment rather than at today's rate - which is the only correct way to do it and the reason a single-rate calculator is wrong for every estate open across a change.
The published figure is the series itself with each change dated, plus the current rate, the spread over base, and the count of changes in the last five years.
29 candidate sentences on these pages were refused by a reviewer; each refusal and its reason is recorded in the review ledger.
Sources (7)
- GOV.UK: rates and allowances - HMRC interest rates for late and early payments(the publisher's own terms; quoted for reporting and comment)
- GOV.UK: HMRC interest rates for late and early payments (publication)(the publisher's own terms; quoted for reporting and comment)
- GOV.UK: Rates and allowances - Inheritance Tax thresholds and interest rates(the publisher's own terms; quoted for reporting and comment)
- Bank of England Bank Rate database(the publisher's own terms; quoted for reporting and comment)
- IHTA 1984 s.233: interest on unpaid tax(the publisher's own terms; quoted for reporting and comment)
- GOV.UK: Inheritance Tax payment deadlines(the publisher's own terms; quoted for reporting and comment)
- Bank of England: the interest rate (Bank Rate)(the publisher's own terms; quoted for reporting and comment)
Cite or embed this figure
Cite or embed this figure
The IHT Interest Series carries 6 published figures read from 2 sources' own pages; the 4 published figures given by rate run from 0.50 to 7.75 percent, read 17 October 2026.
2 of the 7 named sources read in full publish a figure; 5 publish none, read 17 October 2026.
IHT Interest Series, rate Bank of England Bank Rate: median 3.75 percent across 1 source, read 17 October 2026.
IHT Interest Series, rate repayment interest minimum floor: median 0.50 percent across 1 source, read 17 October 2026.
IHT Interest Series, rate late payment interest: median 7.75 percent across 1 source, read 17 October 2026.
IHT Interest Series, rate repayment interest: median 2.75 percent across 1 source, read 17 October 2026.
IHT Interest Series, spread over Bank Rate late payment interest, base rate plus: median 4 percent across 1 source, read 17 October 2026.
IHT Interest Series, spread over Bank Rate repayment interest, base rate minus: median 1 percent across 1 source, read 17 October 2026.
Cite as: "Corp Tax Calculator IHT Interest Series", updated 2026-10-21, https://corptaxcalculator.co.uk/datasets/iht-interest-series/.
Download the CSV (6 rows, computed 2026-10-21)