Tax Returns for Deceased Estates

Administering the financial and tax affairs of a deceased person is a core statutory obligation assigned to the estate's personal representatives (PRs)—known legally as executors if named in a valid will, or administrators if the individual died intestate (without a will).

The tax compliance lifecycle following a death is split into two entirely separate legal frameworks: finalizing the individual's personal tax position up to their date of death, and managing the separate tax liabilities generated by the estate itself during the administration window.

Phase 1: The Deceased’s Final Personal Return (Up to Date of Death)

The personal representatives are responsible for reporting all taxable income and capital gains generated by the deceased from 6 April of the final tax year up to the exact date of death.

HMRC must be formally updated using the government's secure Tell Us Once service or by contacting the dedicated bereavement services helpline. HMRC will then determine if a final personal Self Assessment return is mandatory.

Critical Structural Rules for the Final Return:

• Full Personal Allowance Preserved: The deceased is legally entitled to their complete £12,570 personal tax allowance for the year of death, regardless of how early in the tax year the death occurred. The allowance is not scaled down or pro-rated.
• The PAYE Tax Refund Phenomenon: If the deceased's income was taxed via Pay As You Earn (PAYE) on a salary or private pension, the final calculation routinely triggers a tax refund. This happens because the PAYE system spreads the personal allowance evenly across 12 months; upon death, the unused balance of the full £12,570 allowance is applied immediately against the compressed income period, often producing a repayment due to the estate.
• The Submission Method: Outstanding returns for tax years prior to the year of death can be filed online as normal. However, the return for the final period up to the date of death must generally be submitted on paper via a modified SA100 Individual Tax Return form, unless you are a formally registered personal representative utilizing compliant third-party commercial software.

Phase 2: Income Generated During the Administration Period

The day after the date of death marks the birth of a brand-new, independent tax entity for HMRC tracking: The Estate in Administration. Any new income or capital growth generated by the deceased’s assets before they are formally distributed to the beneficiaries (such as rental income from buy-to-let properties, stock dividends, or bank interest) belongs legally to the estate.

The Informal Administration Procedure (The £500 Safety Buffer)

To cut down on administrative burdens for small, uncomplicated estates, HMRC applies a specific relaxation rule:

The Income Exemption Limit: If the total gross income generated by the estate’s assets consists entirely of bank interest and standard dividends, and does not exceed £500 across the entire tax year, the estate is completely tax-exempt.

Under this informal threshold, the personal representatives are not required to report the income or pay any tax to HMRC. However, if the estate generates any rental profits, or if the bank interest crosses the £500 line, the entire income pool becomes fully taxable from the first pound.

The Formal Administration Procedure (Form SA900)

If the estate's income breaches the informal parameters, the personal representatives must formally register the estate with HMRC and file an annual SA900 Trust and Estate Tax Return.

The estate is a distinct tax taxpayer and does not receive a personal allowance or individual savings allowances. It faces flat tax rates from the very first pound of income:

$$\text{Tax Rates for Personal Representatives} = \begin{cases} \mathbf{10.75%} & \text{on Dividend Income} \ \mathbf{20%} & \text{on All Other Income (Rent/Interest)} \end{cases}$$

Capital Gains Tax and the "Death Reset"

When assets pass from a deceased individual into their estate, the tax system grants a vital relief known as the CGT Death Reset.

HMRC completely wipes away any accumulated, unrealized capital gains locked within the deceased's portfolio. The estate's personal representatives acquire the physical property, land, or shares at their exact market value on the date of death, which becomes the estate's new historical cost basis.

Capital Gains Realized by the Estate:

• If the personal representatives liquidate an estate asset (such as selling a property or executing a stock trade) during the administration period, Capital Gains Tax is calculated strictly on the growth that occurred between the date of death and the eventual date of sale.
• The estate receives an individual £3,000 Capital Gains Tax Annual Exempt Amount, but this entitlement is temporary. It is only granted for the tax year in which the individual died and the subsequent two tax years, after which the estate's tax-free capital buffer drops to exactly £0.
• Remaining capital profits are taxed at standard individual investment tiers (18% or 24% for residential property, and 18% for standard assets or shares).

Strict Statutory Deadlines for Personal Representatives

Managing an estate requires close tracking of paper and digital submission deadlines to avoid incurring late-filing fines out of the estate's residue funds:

• Paper SA900 Estate Returns: Must physically reach HMRC by 31 October following the close of the corresponding tax year.
• Online SA900 Estate Returns: Must be securely transmitted via commercial API software by 31 January following the close of the tax year.
• The 60-Day Residential Property Rule: If the personal representatives sell a residential property belonging to the estate and generate a taxable capital gain, they must submit a standalone Property CGT Return and pay the estimated tax within 60 days of the legal completion date, completely independent of the standard year-end SA900 cycles.

Key Points to Remember

• The final personal tax return handles income received up to the date of death and retains a full £12,570 personal allowance.
• Due to the way PAYE spreads tax allowances, final personal calculations routinely trigger an immediate refund for the estate.
• Estate income under a flat £500 annual threshold is completely exempt from reporting under informal administration rules.
• Form formal estates, personal representatives must report income on an SA900 return, facing flat tax rates of 10.75% or 20%.
• Capital assets receive a complete "death reset," stepping up to full open-market value at the date of death.
• Estates enjoy an individual £3,000 CGT allowance for the year of death and the following two tax years only.