The Inheritance Tax Bill Lands Before the House Can Be Sold

There can be inheritance tax on a house with a mortgage, but only on the equity. The outstanding mortgage is deducted from the property's value, so what counts towards the estate is what is left after the debt, not the figure an estate agent puts on the front door. That much is straightforward, and it is the answer most people are looking for.

The problem that actually catches families is the timing. Inheritance tax is due by the end of the sixth month after the month of death. The grant of probate — the document without which the house cannot be sold — is normally issued only once the tax has been paid or formally arranged. So the family is asked to find money out of an estate whose main asset is a house, before they are legally able to sell that house. The tax has to be paid first and the sale comes second, which is the wrong way round for almost everybody.

That deadlock is what this page is about: not the thresholds, which are published everywhere, but the cashflow gap between the bill landing and the property completing, and the ways families actually bridge it.

What the mortgage does to the value

Inheritance tax is charged on the net value of what someone owned. Debts secured on an asset come off that asset's value, so a mortgage, a further advance and a secured loan are all deducted before the house is counted.

Two practical points follow. First, get the balance at the exact date of death from the lender, in writing, rather than working from the last statement. Second, the valuation used is the open market value at the date of death, and where tax is genuinely in play, that should be a formal valuation from a chartered surveyor rather than a free agent's appraisal. HMRC can and does challenge weak valuations, and a figure that has been pitched low to reduce the tax will cause more trouble than it saves.

Equity release and lifetime mortgages are deducted in the same way, and because the interest on them rolls up, the deduction is often far larger than the family expects — sometimes large enough to remove the tax question altogether while creating a much more urgent repayment problem. Where the borrowing was interest-only with no repayment vehicle, the position is set out in interest-only, nothing saved: what the lender wants on death.

Where the property was jointly owned and the survivor is now carrying the whole loan, remember that the debt does not halve on death even though the deceased's share of the house does. That distinction is explained in why the survivor on a joint mortgage owes all of it.

House values do most of the work in deciding whether an estate is taxable at all, and they vary enormously by region. HM Land Registry publishes the official monthly measure.

Source: HM Land Registry, UK House Price Index, published under the Open Government Licence v3.0.

Whether tax is due at all

Most estates pay nothing, and it is worth establishing which side of the line you are on before worrying about deadlines.

Every estate has a nil-rate band of £325,000. Where a home is left to direct descendants — children, stepchildren, adopted children, grandchildren — a residence nil-rate band of up to a further £175,000 may apply. Anything left to a surviving spouse or civil partner is generally exempt altogether, and any unused proportion of a deceased spouse's bands can be transferred to the survivor, which is how a married couple can end up with up to £1 million available between them. The residence band is reduced by £1 for every £2 by which the net estate exceeds £2 million.

Anything above the available bands is taxed at 40%. Where at least 10% of the net estate is left to charity, the rate on the remainder falls to 36%.

Source: HM Revenue and Customs and GOV.UK, Inheritance Tax guidance, published under the Open Government Licence v3.0. Bands and rates are set by government and can change, so confirm the current figures before relying on them.

Two things commonly push an estate over the line without the family realising. Gifts made in the seven years before death are brought back into the calculation, and the tax on them can fall on the person who received the gift rather than on the estate — see who pays the tax on a gift made within seven years. And a house given away while the giver carried on living in it is usually still treated as theirs, however long ago the deed was signed, which is the trap covered in giving the house away but living in it still counts as yours.

Why the bill arrives before the sale

Here is the sequence that produces the trap, in order.

The personal representatives value the estate and complete the inheritance tax account. Where tax is payable, HMRC must be paid, or an instalment election made, before it issues the reference that HM Courts and Tribunals Service needs in order to grant probate. The grant is what gives the executors legal authority to sell the house. Without it, no buyer's solicitor will complete.

Meanwhile the six-month deadline is running from the end of the month of death, and it does not pause because probate is slow, or because the house has not sold, or because nobody in the family has that kind of money.

So the order of events is: pay the tax, get the grant, market the house, find a buyer, complete, then have the money. The gap between the first step and the last is routinely a year. The estate is also paying the mortgage, insurance and council tax throughout, and the lender has a timetable of its own that takes no account of HMRC's.

Interest runs on unpaid inheritance tax from the due date, regardless of the reason for the delay. HMRC sets the rate and changes it, so check the current figure rather than assuming.

Five ways families actually bridge the gap

The Direct Payment Scheme. This is the first thing to ask about and the one most families miss. Banks and building societies that take part will pay inheritance tax directly to HMRC from the deceased's own accounts, before the grant, on the personal representatives' instruction. National Savings and Investments holdings can be used the same way. If the person who died had money sitting in a frozen account, this is the route that unlocks it for the tax bill specifically. It is done on a dedicated HMRC form and the bank will want its own paperwork alongside.

The instalment option on the house. Land and buildings qualify for payment in instalments, which is dealt with in the next section. It converts an immediate lump sum into a much smaller first payment, which is often enough on its own to get the grant issued.

Beneficiaries lending the money to the estate. Common, quick and free, where anyone has it. Record it properly as a loan to the estate, repayable on distribution, with a signed note. Informal arrangements between siblings during a bereavement have a way of becoming disputes eighteen months later.

An executor's loan or bridging facility. Specialist lenders and some banks will lend to an estate against the property, secured and repaid on completion of the sale. It works, it is quick, and it is expensive, so treat it as the option you take when the others have been exhausted rather than the first call. Compare the total cost against HMRC's interest on late payment before deciding, and take independent advice.

Life insurance written in trust. This is the reason whole-of-life cover exists as a product category. A policy held under trust generally sits outside the estate, so it does not add to the tax bill, and it can usually be paid to the trustees without waiting for the grant — which is precisely the gap this page describes. Trustees can then lend or pay the money to the executors to meet the tax. The payments into the policy are themselves gifts and are often covered by the exemption for gifts made out of normal income, which is worth checking. Whether cover can be offered at all, and on what terms, depends on age, health and underwriting, and older applicants are underwritten carefully. If this is the gap you are trying to close in advance, you can get life insurance quotes and have an FCA-authorised broker set it up under the right trust wording; the trust is what makes it work, and a policy left outside one can increase the very bill it was meant to pay.

The instalment option, and its trapdoor

The tax attributable to land and buildings can be paid in ten equal annual instalments. The first is due on the ordinary due date — the end of the sixth month after the month of death — and the rest fall annually after that. Interest is added to the outstanding balance, so instalments cost more overall than paying at once.

The election is made when the inheritance tax account is submitted, and paying the first instalment is usually enough for HMRC to release the reference that allows the grant application to proceed. For an estate that is asset-rich and cash-poor, this is often the difference between being stuck and being able to move.

Then the trapdoor. If the property is sold, the whole outstanding balance becomes payable immediately. The instalment option is not a way of spreading the tax across a decade while quietly selling the house in year two; it is a way of holding a property that the family intends to keep. Families who elect for instalments and then sell within a year or two find the entire remaining liability, plus interest, falling due out of the completion money. That is not necessarily a bad outcome — the sale produces the cash — but it must be planned for rather than discovered by the conveyancer a fortnight before completion.

Where a beneficiary wants to keep the house and take on the borrowing, the tax position and the lending position have to be solved together, and neither is guaranteed. That combination is set out in inheriting a house and the mortgage that came with it. Where a parent was a borrower but not an owner, the ownership and the tax follow different people, which is explained in joint borrower sole proprietor: when the parent on it dies. And where the home was financed through an Islamic home purchase plan, the deductible amount is the outstanding finance under the plan rather than a conventional mortgage balance.

If the house then sells for less than the probate value

This happens more often than families expect, particularly where the valuation was taken at the date of death and the sale completes a year or more later into a softer market, or where the survey turns up work that has to be reflected in the price.

Tax has been paid on the higher figure. Relief is available: where qualifying land or buildings are sold within four years of the death for less than the value on which tax was charged, the sale price can be substituted and the overpaid tax reclaimed. It is a claim, not an automatic adjustment, and it has to be made by the person who paid the tax on the property. The full mechanics, including the traps around buying another property in the same period, are in the house sold for less than the probate value.

The practical lesson is to keep the completion statement and the original valuation together in the estate file, and to compare them deliberately rather than assuming the tax position closed when the grant was issued.

Scotland and Northern Ireland

Inheritance tax is a UK-wide tax. The bands, the rates, the six-month deadline and the instalment option are the same in every part of the United Kingdom, and HMRC administers them centrally.

What differs is the estate machinery around them. In Scotland, the authority to administer an estate is confirmation obtained from the sheriff court rather than a grant of probate, and the inventory of the estate is prepared on a Scottish form. Scottish succession law also gives a surviving spouse or civil partner prior rights, including rights in the family home up to a statutory value, and gives a spouse, civil partner and children legal rights over the moveable estate. Those entitlements can change who receives what — and therefore which exemptions apply — quite apart from the tax rules. mygov.scot sets out the Scottish process.

In Northern Ireland, probate and letters of administration are obtained through the Northern Ireland Courts and Tribunals Service, and succession law differs from England and Wales, though the tax itself does not. nidirect is the local starting point.

Free and independent help is available everywhere before you commit to a plan. GOV.UK holds the official guidance and forms, MoneyHelper is government-backed and covers bereavement and mortgages, and Citizens Advice can help with the wider estate. For an estate of any size or complexity, a solicitor or a chartered tax adviser is money well spent, because the mistakes here are expensive and they are made once. The rest of this subject sits in our guide to mortgages and property when someone dies.

Frequently asked questions

Is inheritance tax charged on a house that still has a mortgage?

The outstanding mortgage is deducted from the property's value, so only the net equity counts towards the estate. Whether tax is actually due depends on the whole estate measured against the available nil-rate bands, not on the house considered in isolation. Get the balance at the date of death from the lender in writing, and use an open market valuation at that date rather than a later or optimistic figure.

When does inheritance tax have to be paid?

It is due by the end of the sixth month after the month of death, and HMRC charges interest on anything unpaid after that. Because the grant of probate is normally issued only once the tax is paid or formally arranged, families routinely have to meet the bill before any sale completes. The Direct Payment Scheme, which lets banks pay HMRC straight from the deceased's frozen accounts, is the first route to ask about.

Can we pay the tax on a house in instalments?

HMRC allows the tax attributable to land and buildings to be paid in ten annual instalments, with interest added. The first instalment is due on the ordinary due date, and paying it is often enough to unlock the grant. But if the property is later sold, the outstanding balance becomes payable immediately, so the instalment option buys time for a family keeping the house rather than reducing the bill for a family selling it.