Probate Interest Calculator

Probate Interest Method

The calculator uses a single annual rate and simple daily interest. That is useful for a quick estate-account estimate, but it is not a final HMRC calculation where the official rate changed during the period. If the delay spans several HMRC rate changes, split the calculation into date bands and add the interest from each band. The editable rate field is deliberate because late-payment interest rates move over time.

Inheritance tax normally has a due-date rule linked to the end of the sixth month after the month of death, although instalment options can apply to some assets. Probate and tax timing are related but not identical. An executor may need to pay inheritance tax before a grant is issued, and interest can run even while paperwork is being gathered. The calculator estimates interest on the outstanding amount only; it does not calculate the inheritance tax itself.

Worked Estate Interest Examples

Interest Planning Table

Due Date And Rate Checks

Before relying on the result, check the correct due date. For inheritance tax, the due date can depend on the date of death, asset type and whether tax is payable by instalments. If land, business assets or certain shares are involved, instalment rules may alter the payment pattern. If payment is delayed because assets cannot be sold, interest may still accrue. The calculator cannot decide which assets qualify for instalments or whether reliefs apply.

Check the rate as well. HMRC late-payment interest rates are published and can change when the Bank of England base rate changes. A long estate administration period may cross more than one rate. In that case, calculate each segment separately: amount outstanding, start date, end date, rate for that period, then add the segments. The single-rate field is best for short periods or rough reserves.

Executors should keep a record of interest estimates, payments, HMRC statements, estate-bank interest and professional advice. Beneficiaries may ask why money was kept back. A clear reserve note is easier to explain than an unexpected deduction at the end. If the estate is insolvent, disputed, tax-heavy or dependent on selling property, get qualified advice before distributing funds.

Executor Payment Planning

Interest estimates are most useful before money leaves the estate. If a property sale is delayed, the executor can estimate the interest reserve and explain why funds are being held back. If beneficiaries request an interim distribution, the interest figure can be included with other reserves such as tax, legal costs, utilities, insurance and clearance costs.

Do not calculate interest only at the end. Recalculate when a payment is made, when HMRC changes rates, when a property sale completes or when a statement arrives. If a partial payment is sent, start a new calculation for the remaining balance from the next day or from the relevant HMRC allocation date. Estate accounts should show the method clearly enough for another person to follow the figures.

Where an estate has instalment-option property, business assets, agricultural property or quoted shares sold at a loss, the interest position can interact with reliefs and payment choices. That is a point for tax advice. The calculator gives a transparent arithmetic estimate so the executor can ask better questions.

Interest And Estate Income

If the estate earns bank interest while tax interest is accruing, record both. They are separate lines: one may be estate income, while the other is a cost of late payment. Keeping them apart helps beneficiaries see the net position and helps the executor explain why money was retained before final distribution.