How Much Should You Save for Tax?

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    Written by:

    Steven Hillman FCA

    Chartered Accountant

    Updated on:

    16 March 2026

    How Much Should You Save for Tax?


    One of the most common questions I get from clients is:


    “How much should I be putting aside for tax?”


    It’s a good question, and getting it right makes a big difference. Save too little and you get a nasty surprise. Save too much and you tie up cash you could be using in your business.


    The aim is simple. Build a system so your tax bill is expected, not stressful.


    PAYE vs Self-Employed – Why It Feels Different


    When you’re employed, everything is taken care of through PAYE. Tax and National Insurance are deducted before you even see the money.


    When you’re self-employed or running a side hustle, it’s different. You receive the income first, and it’s your responsibility to set money aside for tax.


    That’s where most people come unstuck.


    The 25% Rule (A Good Starting Point)


    For many basic rate taxpayers, saving 25% of your profits is a sensible starting point.


    That broadly covers:


    • 20% income tax
    • National Insurance
    • A small buffer


    It works because:


    • You have a personal allowance of £12,570
    • You can deduct business expenses
    • Your effective tax rate is often lower than you expect


    But this is only a guide.


    If your income increases, or you move into higher rate tax, you will likely need to save more.


    A Simple System That Works


    The biggest mistake people make is not separating their tax money.


    What we recommend is a simple approach.


    Every time you get paid, move a percentage straight into a separate bank or savings account.


    For example:


    • You receive £1,000
    • You move £250 into your tax account


    That money is no longer available to spend.


    We call this a tax allocation approach. It removes the guesswork and builds discipline into your system.


    Don’t Forget Payments on Account


    If your tax bill is over £1,000, HMRC will usually ask for Payments on Account.


    This catches people out.


    In simple terms:


    • You pay your current year’s tax
    • Plus advance payments towards the next year


    Example:


    • Tax bill: £2,000
    • January: £2,000 plus £1,000
    • July: £1,000


    So you end up paying £4,000 across two payments, even though your tax bill is £2,000.


    This is not extra tax. It is just paying part of the next year early. But it can affect cash flow if you are not prepared.


    Higher Earners Need to Save More


    UK tax is progressive.


    Once your income goes above £50,270, you move into higher rate tax.


    At that point, 25% is unlikely to be enough.


    If you are approaching or above that level, it is worth reviewing your saving percentage properly.


    Other Things to Factor In


    Depending on your situation, you may also need to allow for:


    • VAT, if your turnover exceeds £90,000
    • Student loan repayments
    • Pension contributions
    • Other personal income


    These all affect how much you should be setting aside.


    Final Thoughts


    For many people, 25% is a good starting point, but it is not a one size fits all answer.


    The key is consistency:


    • Set a percentage
    • Move it regularly
    • Keep it separate


    Do that, and your tax bill becomes something you plan for, not something that catches you out.

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