The Executor’s Countdown: Meeting the Inheritance Tax Deadline Without a Fire Sale

Death creates two parallel processes. One is personal: grieving, notifying family and arranging a funeral. The other is administrative: valuing assets, reporting to HM Revenue & Customs and obtaining probate. The second process has a clock attached. For inheritance tax, the deadline is generally six months after the end of the month in which the person died. In 2026, with probate workloads and property sales still capable of moving slowly, that clock deserves early attention.

The clock starts before probate

Executors often assume that tax is paid only when probate is granted. That is not the case. Inheritance tax is due by the end of the sixth month after the month of death. If it is late, interest can accrue. Probate may still be months away, particularly where the estate is complex, a property must be sold, or HMRC has queries. The deadline does not wait for the grant.

This is why liquidity planning matters from the first week. An estate can be asset-rich and cash-poor: a house, a portfolio, a business interest or a farm may be valuable, but not easily converted into money at short notice. A forced sale in a weak market can cost the family far more than the tax itself.

Why a last-minute approach is risky

Some estates have enough cash to pay the tax comfortably. Others do not. If the main asset is the family home, the executor may need to sell it, borrow against it, use an instalment option or rely on a direct payment arrangement with a bank. Each route has conditions and timescales. Leaving the decision until the sixth month reduces the room for negotiation and increases the risk of a poor outcome.

Beneficiaries may also have expectations about distributions. Executors should explain early that inheritance tax, funeral costs, debts and administration expenses come before any inheritance. Clear communication reduces suspicion later.

A practical countdown for executors

First 30 days

Locate the will and any codicils. Register the death and obtain death certificates. Secure property, post and digital accounts. Identify the main advisers, banks, pension providers and insurers. Make a first list of assets and liabilities, even if values are provisional. Check whether the estate is likely to be within the inheritance tax threshold or may qualify for reliefs and exemptions.

Months one to three

Build a proper valuation schedule. This may require a professional property valuation, share valuations and details of any business or agricultural assets. Review gifts made in the seven years before death, as these may affect the tax position. Gather paperwork for reliefs such as spouse exemption, charity exemption, business relief or agricultural relief where relevant. The executor or adviser should prepare the inheritance tax account and supporting schedules.

Months three to five

Submit the probate application and the inheritance tax paperwork. Arrange payment of tax or apply for an instalment option where assets qualify. Some banks will pay inheritance tax directly from the deceased’s account, which can ease cash flow. If a property is to be sold, instruct an agent early, but remember that a sale may not complete before the tax deadline. An executor loan or a short-term facility may be preferable to a distressed sale.

Month six

Confirm that payment has reached HMRC or that an instalment arrangement is in place. Keep evidence. If there is a genuine difficulty, contact HMRC before the deadline rather than after it. Interest and penalties are easier to manage when the executor has acted promptly and can explain the position.

The instalment option is useful, but not universal

Certain assets, including land, buildings and some shares, may qualify for payment by instalments over ten years. This can relieve immediate pressure, but it is not a complete solution. Interest may apply, and the estate still needs a plan for each instalment. The option should be considered alongside the expected sale timetable and the needs of beneficiaries.

Paperwork that should be ready

A well-organised executor file will include the will, death certificate, asset and liability schedule, recent tax returns, pension and insurance details, gift records, property valuations, mortgage statements, share certificates and correspondence with HMRC. Digital accounts and online statements should be recorded without sharing passwords in insecure ways. Professional advice from a solicitor or accountant is often worthwhile, not because the forms are impossible, but because the deadlines and reliefs interact.

The wider family point

The six-month clock is not only a tax issue. It is a test of how well a family has prepared for the practical side of death. A letter of wishes, a clear list of advisers and an early conversation about liquidity can spare executors from guessing. In 2026, the most valuable inheritance planning may be the paperwork that lets a family pay the tax, obtain probate and sell nothing in haste.