Example result based on the prefilled values.
New Rent
$1,050.00/month
Monthly Increase
$50.00
Annual Extra
$600.00
Continue your plan
Useful next calculations
When to use this calculator
- Before buying, renting, refinancing, or reviewing a property investment.
- When you want to compare cash flow, yield, growth, and ownership costs side by side.
- When you need a fast estimate before speaking to an agent, lender, or adviser.
- When you are assessing whether a rental property still makes financial sense after a mortgage rate change.
- When you want to compare the total cost of renting against owning over a five- or ten-year horizon.
A realistic US planning example
Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.
Current Monthly Rent ($)
6
Increase (%)
5
After entering these figures, review new rent, monthly increase and annual extra together rather than in isolation — each metric tells a different part of the story. Then rerun the tool with one input adjusted to see which variable has the biggest effect on all three outputs before you settle on a plan.
How to read your results
New Rent
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Monthly Increase
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Annual Extra
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
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 GOV.UK guidance for private landlords.
Official references
Common mistakes
- !Using an assumption that is not supported by a current local quote, bill, statement or official source.
- !Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- !Mixing monthly and annual inputs without converting them consistently.
- !Forgetting location-specific taxes, fees, eligibility rules or payroll deductions where they apply.
- !Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.
- Use the result to prepare better questions for a lender, provider, adviser or employer rather than treating it as a final answer.
Frequently asked
Use arrow keys to navigate items, Enter or Space to expand/collapse.