How Much Tax Should You Actually Be Saving as a UK Small Business?

Running a small business in the UK comes with plenty of rewards, but staying on top of your tax obligations can feel less straightforward. One of the most common questions we hear at Blue Rocket Accounting is:

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

The honest answer is: it depends. But there are clear guidelines you can follow to stay safe, avoid surprises, and keep your cash flow healthy.

Why Saving for Tax Matters

Unlike employees, most small business owners don’t have tax deducted automatically. Whether you’re a sole trader or running a limited company, you’re responsible for setting money aside and paying HMRC at the right time.

Failing to plan ahead can lead to:

• Unexpected tax bills
• Cash flow stress
• Late payment penalties

A simple system for saving tax can remove all of that pressure.

If You’re a Sole Trader

As a sole trader, your tax is based on your profits (income minus allowable expenses), not your total revenue.

What You’ll Typically Pay:

• Income Tax (20%, 40%, or 45% depending on your earnings)
• National Insurance Contributions (NICs)

How Much Should You Save?

A good rule of thumb:

• Save 25%-30% of your profits

If your income is higher (pushing into higher-rate tax bands), consider increasing this to:

• 30%-35%

Example:

If your profit is £40,000:

• Set aside roughly £10,000-£12,000

If You Run a Limited Company

Limited companies are taxed differently, which can be more tax-efficient but also slightly more complex.

What You’ll Typically Pay:

• Corporation Tax (currently up to 25% depending on profits)
• Dividend Tax (when you pay yourself dividends)
• PAYE tax & NICs (if you take a salary)

How Much Should You Save?

A safe approach is:

• 19%-25% of company profits for Corporation Tax
• An additional 8%-15% for dividend tax (depending on your income level)

Practical Rule:

Many directors set aside:

• 25%-30% of profits overall

Don’t Forget Payment Timing

One of the biggest traps for small business owners is timing.

• Sole traders pay tax via Self Assessment (usually twice yearly, including payments on account)
• Limited companies pay Corporation Tax 9 months after the end of their accounting period

This delay can make it feel like you have more cash than you actually do, until the bill arrives.

A Simple System That Works

We recommend setting up a separate “tax savings” account and transferring a percentage of your income regularly.

For example:

• Every time you get paid, move 25%-30% into a separate account
• Treat it as untouchable

This creates a buffer and removes the guesswork.

Factors That Can Change Your Tax Bill

Your exact tax liability will depend on:

• Your total income
• Allowable expenses
• Pension contributions
• Use of tax reliefs and allowances
• Whether you’re VAT registered

This is why personalised advice can make a significant difference and often save you money.

Final Thoughts

While there’s no one-size-fits-all answer, most UK small business owners should be setting aside:

• 25%-30% of profits as a baseline
• More if you’re a higher earner

Getting into this habit early keeps you in control and avoids unpleasant surprises.

At Blue Rocket Accounting, we help business owners build simple, stress-free systems for managing tax, so you can focus on growing your business with confidence.

Need clarity on your specific situation? Get in touch with Blue Rocket Accounting for tailored advice and proactive tax planning.

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