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Capital Gains Tax Planner

Estimate potential UK Capital Gains Tax on planned disposals, save alternative disposal scenarios, and compare them within the planner to see how timing, losses, ownership, and assumptions may affect your estimated tax position and likely after-tax proceeds before taking action.

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Estimate and compare UK Capital Gains Tax scenarios

Planiva’s Capital Gains Tax Planner helps you build a structured estimate for a planned asset disposal in the UK, save different disposal scenarios, and compare them within the planner. It is designed for planning and scenario comparison, so you can explore gains, losses, timing choices, ownership assumptions, and estimated after-tax proceeds before deciding what to do next.

How it works

Enter the disposal details

Add the asset details, disposal value, acquisition cost, and relevant allowable costs to create your starting estimate.

Adjust planning assumptions

Explore how losses, ownership split, timing, or other relevant planning assumptions may affect the estimated position.

Compare scenarios

Review saved scenario comparisons to see how changes in assumptions alter the estimated gain, tax, and after-tax proceeds.

Review the estimated position

See the projected gain, indicative tax outcome, and estimated after-tax proceeds to support more informed planning.

What this planner helps you do

Use the planner to turn an initial disposal idea into a clearer view of the tax implications before moving ahead or taking advice.

Estimate potential tax exposure

Build a structured estimate of the potential Capital Gains Tax effect of a disposal using the facts and assumptions you enter.

Compare disposal options

Test how changes in timing, ownership, losses, or assumptions may affect the estimated result.

Understand the main drivers

See which inputs are having the biggest effect on the estimated gain and tax outcome.

Focus on estimated proceeds after tax

Look beyond the disposal value and see a more realistic estimate of what may remain after tax.

Core features

The planner is designed to support practical disposal planning in a clearer and more structured way.

Scenario-based disposal modelling

Build, save and compare disposal cases within the planner to test how the estimated position changes under different assumptions.

Disposal and cost inputs

Capture the core values that shape the estimate, including disposal proceeds, acquisition cost, and allowable costs.

Comparison-ready assumptions

Adjust relevant assumptions that may affect the estimated result so different planning options are easier to assess.

Ownership-aware comparisons

Explore how different ownership assumptions may affect the estimated gain and tax position.

Decision-focused summaries

Review outputs and comparison summaries designed to support planning rather than a single static figure.

Scenarios you can model

The planner is suited to common disposal-planning situations where you want a clearer estimate before proceeding further.

Single planned disposal

Estimate the potential Capital Gains Tax effect of one planned disposal using your current assumptions.

Compare disposal timing

Explore how a different timing assumption or tax-year context may change the estimated position when compared with your baseline scenario.

Ownership split scenarios

Test how different ownership assumptions may affect the estimated gain and tax outcome.

Loss utilisation scenarios

Compare the estimated result with and without available losses, or under different loss assumptions.

Key assumption comparisons

See how the estimate changes when important planning assumptions are included, excluded, or adjusted across saved scenarios.

Outputs and insights

The planner is designed to return practical outputs that help you assess and compare options more clearly.

Estimated gain summary

See a clear view of the estimated gain position based on the disposal details and assumptions entered.

Indicative tax outcome

Review an indicative view of the potential Capital Gains Tax position for each scenario so the tax effect is easier to compare before you act.

Estimated after-tax proceeds

Understand the estimated net position after tax so different sale timings or assumptions can be compared more realistically.

Scenario comparison view

Compare saved scenarios to see the practical effect of different planning choices, with plain-language impact summaries and exportable outputs.

Who it is for

This planner is best suited to people who want a clearer planning view before making a disposal decision.

Individuals planning to sell or dispose of an asset

Useful if you want an early estimate before selling, gifting, or otherwise disposing of an asset.

People weighing different disposal options

Helpful when you want to compare timing, ownership, or loss assumptions rather than rely on one rough figure.

Users who want planning support before advice

Best for exploring possible outcomes before taking advice, not for tax filing or formal tax calculations.

Notes and limitations

This planner is designed to support planning and comparison. It does not replace professional tax advice, and outputs depend on the facts and assumptions entered.

Shared trust notes

This planner supports scenario modelling and comparison. It is intended to help you think through decisions, not to replace regulated financial, tax, legal, or investment advice.
Outputs depend on the details, assumptions, and tax rules used at the time of modelling. Real-world outcomes can differ if those assumptions change or if relevant information is incomplete.

Planner-specific notes

Estimates may change if disposal facts, cost history, ownership position, or assumptions are incomplete or incorrect.
The planner is intended for planning scenarios and may not reflect every exemption, relief, edge case, or complex fact pattern.
Outputs are indicative estimates to support decision-making and should not be treated as filing-ready tax calculations.
Tax treatment depends on personal circumstances and current rules, so professional advice should be considered before action is taken.

Frequently asked questions

What does the Capital Gains Tax Planner help me do?

It helps you estimate and compare potential UK Capital Gains Tax outcomes for a planned disposal so you can see how different assumptions may affect the result before acting.

Is this a Capital Gains Tax calculator?

It is a planning tool rather than a simple calculator. It is designed to help you build and compare disposal scenarios, not just produce one headline figure.

Can I compare different disposal scenarios?

Yes. You can save different disposal scenarios within the planner and compare assumptions such as timing, ownership, or available losses to see how the estimated result changes.

Is this planner for filing my tax return?

No. It is designed for planning and estimation rather than tax filing or formal tax advice.

Will this give me an exact Capital Gains Tax bill?

No. It provides an indicative estimate based on the information and assumptions entered, not an exact or filing-ready tax amount.

Who is this planner best suited to?

It is best suited to people who want a more structured way to explore likely tax implications before proceeding with a disposal or taking further advice.

Related tools

Capital Gains Tax planning often sits alongside broader tax, cash flow, and long-term planning decisions, particularly when proceeds may be reused elsewhere.

Access the Capital Gains Tax Planner with free early access

Start with free early access to explore this planner, save disposal scenarios, and compare different sale options within the wider planning workbench.