Continue your plan
Useful next calculations
Rates & sources
SDLT/LTT/LBTT bands vary between England, Wales, Scotland and Northern Ireland. Use the appropriate calculator.
Source: HMRC / Welsh Revenue / Revenue Scotland — check the linked guidance and any live quote before acting.
When to use this calculator
- Before buying, renting, refinancing or reviewing a property investment.
- When you want to compare cash flow, tax, yield or ownership costs.
- When you need a fast estimate before speaking to an agent, lender or adviser.
- When you want to see how a rate or price change moves the result.
Example: turning a proposed rent rise into cash terms
Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.
| Input | Value |
|---|---|
| Current rent | £1,100 |
| Increase | 6% |
| New rent | £1,166 |
| Annual extra | £792 |
The annual view matters more than the monthly figure when you want to know how much headroom a rent change actually creates or removes.
How to read your results
New Rent
The figure produced by this output for the inputs you entered. Change one variable at a time if you want to see what drives it.
Monthly Increase
The figure produced by this output for the inputs you entered. Change one variable at a time if you want to see what drives it.
Annual Extra
The figure produced by this output for the inputs you entered. Change one variable at a time if you want to see what drives it.
Method & assumptionsAuthoritative sources
This calculator helps landlords and tenants understand the financial impact of a proposed rent increase. Enter the current monthly rent and the proposed new amount, or use a percentage-based increase, to see the annual difference and cumulative effect over one to five years. The calculator also shows the equivalent increase expressed as a percentage of CPI to help contextualise whether the rise is broadly in line with inflation. It does not determine whether a proposed increase is lawful or constitutes a fair market rent — that assessment requires knowledge of comparable local rents. For guidance on the correct notice procedure under the Renters Rights Act, including the required notice period and prescribed form, refer to the official government guidance guidance for private landlords.
Common mistakes
- !Comparing rent and ownership costs without including taxes, fees and maintenance.
- !Using purchase price alone without testing financing or vacancy assumptions.
- !Relying on yield or growth in isolation instead of reviewing the full property case.
- !Using the wrong national transaction-tax calculator for the purchase location.
What to do next
- Run a second scenario with a higher rate or lower rental yield.
- Compare the result with a buy-versus-rent or mortgage calculator before making an offer.
- Use the matching national transaction-tax calculator for the purchase location.
- Note the key figures to share with your solicitor or lender.
Frequently asked
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