Tax planning tools
Tax calculators for personal, property and business decisions
Use the calculator that matches the question, select the relevant tax year and review the assumptions before relying on the result.
Calculator directory
Choose the question you need to answer
Each tool has a separate purpose. Selecting a tax year inside the calculator keeps the result useful without tying the page to a single year.
Individuals and owner-managed businesses
Income and Self Assessment calculators
Income tax calculator
Estimate Income Tax and employee National Insurance from employment and other taxable income.
Calculate income tax →Self Assessment tax calculator
Bring together employment, self-employment, rent, savings and dividends for an indicative liability.
Estimate Self Assessment →Payments on account calculator
Estimate the balancing payment and advance instalments that may fall due through Self Assessment.
Estimate payments on account →Dividend tax calculator
Estimate dividend tax after considering other income and the selected tax year.
Calculate dividend tax →Landlords, property owners and disposals
Property and Capital Gains Tax calculators
Capital Gains Tax calculator
Estimate taxable gains after acquisition costs, disposal costs, losses and the available annual exemption.
Estimate Capital Gains Tax →Rental profit tax calculator
Estimate taxable property profit and the income tax effect of rental income and allowable costs.
Calculate rental profit tax →Mortgage interest tax relief
Estimate the finance cost tax reduction for an individual residential landlord.
Estimate finance cost relief →Non-resident landlord tax
Compare gross rent, deductible expenses and tax withheld under the Non-resident Landlord Scheme.
Calculate non-resident landlord tax →Limited companies and employers
Company, VAT and payroll calculators
Corporation Tax calculator
Estimate company tax with the selected period, profit level and relevant marginal relief assumptions.
Estimate Corporation Tax →Salary versus dividend calculator
Compare indicative company and personal tax effects of alternative director remuneration.
Compare salary and dividends →VAT calculator
Add VAT to a net figure or extract the VAT element from a gross amount at a chosen rate.
Calculate VAT →Payroll tax calculator
Estimate PAYE, employee National Insurance, employer National Insurance and net pay.
Estimate payroll deductions →Late Self Assessment returns
HMRC late filing penalty calculator
Estimate late filing penalties by delay and return status
This tool considers the staged penalty structure for a late Self Assessment return. Interest, late payment penalties, daily-penalty discretion and HMRC decisions may require separate consideration.
Estimate late filing penalties →Using the result
Check the inputs before acting on the output
A calculator can answer a defined numerical question. It cannot decide whether an amount is taxable, whether a cost is allowable, which person owns the income or whether a relief applies without the supporting facts.
If the result affects a filing, transaction or extraction decision, retain the inputs and confirm the treatment against the underlying records.
Review these points
- the correct tax year or accounting period;
- all income that affects the applicable bands;
- ownership, residency and business structure;
- losses, reliefs and amounts already paid;
- whether the result must be reported separately.
Calculator questions
What a tax calculator can and cannot establish
The tools are designed for useful estimates. The final liability follows the legislation, the selected period and the complete facts.
Why must I choose a tax year?
Rates, bands, allowances and National Insurance rules can change. The tax-year selector applies the rule set available in that calculator for the period you choose.
Can I use a calculator result in my tax return?
Use it as a check, not as a substitute for preparing the return from records. Confirm the tax treatment, reliefs and amounts already deducted or paid before filing.
Which calculator should a landlord use?
Use the rental profit calculator for annual letting results, the mortgage interest tool for the residential finance cost tax reduction and the Capital Gains Tax calculator for a disposal.
Does the salary versus dividend result decide the best option?
No. It provides a numerical comparison under stated assumptions. Cash requirements, available profit, company law, pension planning, benefits, loans and future plans may alter the decision.
Can I ask for a calculation to be checked?
Yes. Send the saved inputs or printed calculation together with the relevant records and explain the decision or filing it will support.