Tax planning software for accountants

Turn tax returns into planning conversations.

Use current tax return data to forecast next year’s liability, test different scenarios and give clients clearer answers before the next deadline arrives.

From £85 per year

WhatIF Planner TaxCalc

Planning value, without a separate planning workflow.

What If? Planner helps practices move from “here is what happened” to “here is what might happen next”, using the data already in the tax return.

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Forecast next year’s tax position

Start with current SA100 data, apply next year’s rules and create a baseline view of the client’s likely liability.

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Model different scenarios safely

Adjust income or other figures to explore outcomes without changing, submitting or interfering with the live return.

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Support better cashflow decisions

Identify where payments on account may need attention and help clients prepare for future tax bills with more confidence.

Tax planning that powers better advice

Turn tax data into forward-looking advice.

WhatIF Planner helps your practice move beyond historic tax return preparation. Use current client data to forecast liabilities, model different scenarios and give clients clearer advice before problems appear.

Forecast future tax liabilities

Use current tax return data to estimate what a client may owe next year, helping them plan earlier and with more confidence.

  • Forecast next year’s liability using current data

  • Give clients earlier visibility of what may be due

  • Support better budgeting conversations

Model different income scenarios

Explore different income, dividend or profit scenarios quickly, without affecting the live tax return.

  • Test different income assumptions

  • Compare outcomes quickly and safely

  • Show clients the impact of future decisions

Review payments on account

Identify where payments on account may be reduced based on projected liability, helping clients avoid unnecessary overpayments.

  • Review projected tax against current payments

  • Spot potential reductions earlier

  • Give clients clearer cash flow guidance

Spot tax increases before year end

Flag projected increases early so clients can budget ahead, set aside reserves and avoid last-minute surprises.

  • Highlight changes before they become urgent

  • Help clients prepare for future tax bills

  • Reduce difficult year-end conversations

Explain advice with clearer figures

Turn complex tax planning into practical, figure-backed conversations your clients can understand.

  • Support advice with real calculations

  • Make client meetings more valuable

  • Build confidence in your recommendations

Add value beyond compliance

Move beyond preparing returns and give clients proactive advice that supports better planning throughout the year.

  • Create more advisory opportunities

  • Strengthen client relationships

  • Deliver more value from existing client data

Tax planning that powers better advice

Give clients fewer surprises and better conversations.

The best planning moments often happen straight after a return is prepared. WhatIF Planner helps your team turn completed tax data into practical forecasts, clear scenarios and more useful client advice.

Data-driven tax forecast dashboard

Future tax projections

Generate a forecast for the following tax year using current return data, so clients can see what may be coming before it becomes urgent.

  • Forecast next year’s tax liability from current data

  • Apply updated tax rules to existing return information

  • Give clients earlier visibility of what they may owe

Works directly with Tax Return Production

What If? Planner sits inside Tax Return Production, using live SA100 data as the starting point for future calculations.

This means you can move straight from completing a return to exploring next year’s position, without rekeying data or switching tools.

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Related products

What If? Planner works alongside your core tax workflow to help you move from compliance to advisory services.

Customer support

If you need help using the planner or interpreting projected tax results, our UK-based support team is available to provide practical guidance.

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Case study

‘Far better than anything I've tried’ – 35 staff firm thrilled with product and support

Liam McHugh, Managing Partner at Steve Pye & Co, knew his firm needed a change. With offices in Norwich and King’s Lynn, a team of 35 staff, and 2,200 clients, the firm had outgrown its previous software. One of the elements it benefited from was TaxCalc’s Charities module. Liam says: "Having previously used IRIS (for charity accounts) and then switched to Excel spreadsheets and Word documents, the module is significantly quicker than IRIS and a lot more flexible, especially when it comes to the layout and detail which can be included in the report of the trustees. It's also really easy to set up and maintain the different funds which a charity can hold."

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Frequently asked questions

 

Add What If? Planner to your tax toolkit.

Designed for accounting practices that want to give more proactive advice using data already held inside TaxCalc Tax Return Production.