If the money must leave the company, calculate extraction tax first. Compare net outcomes before choosing ISA or Premium Bonds.
Should a business owner use an ISA or premium bonds?
The fastest rule: if money must leave the company, work out extraction tax. Then compare the net invested result.
ISAs shelter future returns from income tax and capital gains tax. The annual allowance is £20,000 for 2024/25.
Premium Bonds offer tax-free prizes and preserve capital under NS&I rules. The prize system gives an expected value, not a guaranteed rate.
Read on for the next practical decision step.
Liquidity and access trade-offs
A Cash ISA usually gives predictable interest. Providers often offer instant access, but check their terms.
Premium Bonds allow withdrawal without losing capital. Prize timing and expected return vary with the holding size.
A compact decision line
If extraction tax leaves less than needed for personal goals within 12 months, keep cash in the company. Extraction costs can erase the benefit of a personal wrapper.
A common mistake at this point is assuming company ownership can bypass personal-only rules; that assumption leads to errors.
For reference: ISA allowance was £20,000 in 2023/24 and remained £20,000 for 2024/25.
Opinion for owners deciding now
Owners who prioritise liquidity and predictability should usually keep large sums in the company. This holds if the company has steady cash flow and no planned near-term investments.
If the owner needs personal tax-free shelter and accepts extraction costs, move only the portion that fits personal allowances. Model the numbers first.
Read on for the next practical decision step.
Extraction always triggers accounting and tax steps. Choose the route that gives the best net to the owner.
Dividends: typical steps and net outcome
Paying a dividend needs sufficient retained earnings, a board minute and a dividend voucher. Follow company law and record the paperwork.
Dividend tax bands for 2024/25 give charges of 8.75% basic, 33.75% higher and 39.35% additional. These rates apply after the dividend allowance.
A direct, citable rule: paying a dividend creates no National Insurance cost for the individual. It does create a personal tax charge at dividend rates.
Salary or bonus: what to expect
Salary is grossed up for employer National Insurance and reported via PAYE. The company pays employer NICs on top of gross pay.
Employee NICs and income tax reduce take-home pay. Salary reduces corporation tax as a deductible expense.
Director’s loan account
A director may take a loan from the company. Record it in the director's loan account.
If unpaid after nine months post year end, Section 455 tax can apply at 33.75%. Check the current rate before relying on this figure.
Interest-free loans may be treated as a benefit in kind for the director and require additional tax reporting.
Read on for the next practical decision step.
Assume company profits already faced corporation tax at 25% for 2024/25 where relevant. Use the company rate that applies to your profits.
Distribute £50,000 gross dividend. After a £1,000 dividend allowance, the taxable dividend might be £49,000.
At a 33.75% dividend tax rate the tax due equals £16,537.50. Net to owner equals £33,462.50.
- Assume retained earnings available for distribution = £100,000 (post‑corporation tax). If that sum is taken as a single dividend and the owner is a higher‑rate taxpayer under 2024/25 dividend rules (dividend allowance £1,000; dividend tax 33.75%), the taxable dividend would be £99,000, dividend tax ≈ £33,412.50 and net to owner ≈ £66,587.50.
- By contrast, if the company retains the £100,000 and places it in a short‑term corporate deposit earning 4.0% gross, first‑year interest = £4,000, taxed at 25% corporation tax → net interest £3,000 to the company; any later extraction of that interest to the owner will trigger further dividend/tax charges.
- If the owner instead takes a £100,000 gross salary, employer National Insurance contributions and employee income tax/NICs reduce net take‑home materially.
- As a simple indicative example (actual figures depend on bands and thresholds), a £100,000 gross salary can leave roughly £57,000–£62,000 net and cost the company c. £113,800–£115,000 including employer NICs.
These worked numbers show why comparing extraction tax, Cash ISA liquidity and Premium Bonds expected return is essential. Compare net results, not headline rates.
Corporate alternatives for large surpluses
Companies often need scalable, liquid parking for sums above the owner’s ISA allowance. Corporate vehicles avoid repeated personal extraction costs.
Business savings and notice accounts
Business instant access and notice accounts often carry FSCS protection of up to £85,000 per authorised firm; confirm the provider and structure before placing large sums.
Term deposits lock cash for a set period. They often offer higher fixed rates for that time.
Short-dated gilts, corporate bonds and money
Short gilts are UK government-backed and suit capital preservation over months to a few years. They have low credit risk.
Corporate bonds yield more but carry credit risk. Diversification and laddering reduce reinvestment risk.
Money market funds give daily liquidity. They provide pooled diversification for working surplus cash.
Read on for the next practical decision step.
Table comparison
| Product |
Tax treatment |
Liquidity |
Return certainty |
Limit |
Best for |
| Cash ISA |
Interest tax-free |
Usually instant |
High |
£20,000 pa (2024/25) |
Personal short-term savings |
| Premium Bonds (NS&I) |
Prizes tax-free |
Withdrawable |
Variable expected value |
Holding limit applies |
Capital preservation + chance prizes |
| Business notice/term account |
Taxed inside company |
Depends on term |
Fixed for term |
Usually no personal limit |
Large corporate balances |
| Short gilts / bonds |
Interest/coupon taxed in company |
Variable, market liquidity |
Moderate to high |
No personal limit |
Preservation with yield |
Corporation tax main rate moved to 25% for many companies from April 2023; use the company rate applicable to your profits when modelling extraction outcomes.
Simple decision flow
Start: Is cash surplus after working capital?
Need personal cash within 12 months?
Yes → Consider corporate short-term deposit or extract small amount
No → Compare extraction tax vs keeping company-level investment
Keeping surplus company cash invested in corporate vehicles has accounting consequences. Owners must model tax and regulatory effects alongside returns.
- On the balance sheet, retained cash placed in notice accounts or short gilts appears as ‘cash and cash equivalents’ or ‘short-term investments’.
- Interest and coupon income are taxable within the company at the corporation tax rate, so headline corporate yields must be adjusted by that tax rate when comparing with personal tax-free wrappers. Deposit protection also differs: FSCS cover is up to £85,000 per authorised firm per depositor, so large corporate deposits often require multiple counterparties or ring‑fencing.
- Money market funds and gilts avoid FSCS but carry different liquidity and valuation reporting.
Director movements such as using a director's loan account must be recorded in the ledger. They can attract Section 455 tax if not repaid within nine months post year-end.
Interest-free or under-market loans may create benefit-in-kind reporting. These items affect company cash forecasting and year-end tax provisions.
Read on for the next practical decision step.
Common errors and legal warnings for owners
Company ownership cannot open personal ISAs or buy Premium Bonds in the company name. Check HMRC and NS&I rules before any move.
HMRC ISA guidance
Frequent calculation mistakes
A common error is comparing a gross corporate interest rate with a personal tax-free headline. Always subtract extraction tax when you compare.
What most guides omit is the step where retained profits already faced corporation tax. That matters when computing net owner cash.
Legal obligations and AML checks
NS&I and ISA rules require individual ID and do not accept corporate purchase for personal wrappers. Anti-money laundering checks add friction to any attempt to route corporate cash into personal-only products.
When premium bonds mislead owners
Treat the published Premium Bonds prize rate as an expected value, not a guaranteed yield. Large holdings change prize odds slowly, so annual expected prize scales remain probabilistic.
If the cash must remain for working capital, or the company is an investment business, do not apply the personal-extraction logic set out here. Corporate policy or legal form can make the guidance irrelevant.
If the reader plans to move more than £25,000 out of the company this tax year, consult an accountant and a regulated financial adviser. Bring company surplus, retained earnings and planned liabilities.
Frequently asked questions
Can a company buy premium bonds or open an ISA?
No. Premium Bonds and ISAs are personal-only products and must be held in an individual's name. Companies cannot open them.
Net tax equals the taxable dividend multiplied by the owner’s dividend tax rate for the year. Use current rates for accurate figures.
Are premium bond prizes tax-free to the owner?
Yes. Prize money from NS&I Premium Bonds is tax-free for the individual who holds the bond.
What protection applies to business savings?
Bank deposits used by a company may be protected by the Financial Services Compensation Scheme for up to £85,000 per authorised firm; check provider status.
A director’s loan can be cheaper short term. Section 455 tax can apply if not repaid, making it expensive if the loan remains unpaid.
Yes. Employer pension contributions reduce company profits and give personal pension benefit. That can lower immediate extraction via salary or dividends.
Read on for the next practical decision step.
What to do next
Step 1: confirm the true surplus after leaving working capital and tax provisions. Use realistic buffers for cash flow.
Step 2: run two quick calculations: net if withdrawn as dividend and net if left in company and invested. Compare results.
Step 3: use the mini-calculator formulas below to test scenarios. Bring results to an accountant or regulated adviser.
Inputs:
Company surplus S
Corporation tax rate c (e.g., 0.25)
Extraction route: dividend or salary
Personal dividend tax rate d (e.g., 0.3375)
Personal income tax rate i (if salary)
Employer NIC rate eNIC (if salary)
Employee NIC rate empNIC (if salary)
ISA allowance A (e.g., 20000)
If dividend route:
Net_to_owner = (S_postCT - dividend_allowance) * (1 - d) + min(S_postCT, dividend_allowance)
(clarifying that S_postCT must be the amount available after corporation tax; if you start from a pre‑tax profit P, first apply corporation tax: S_postCT = P * (1 - c), then apply the dividend calculation).
If salary route:
Gross_salary must be solved by applying progressive income tax bands and employee NIC thresholds. Company_cost ≈ Gross_salary * (1 + eNIC) where employer NICs apply above thresholds.
Net_to_owner equals Gross_salary minus income tax and employee NIC. The original linear formulas are approximations and can misstate outcomes.
Expected_PremiumBond_return = Net_to_owner * prize_rate (label as expected)
Compare Net_to_owner placed in Cash ISA up to A and remainder outside ISA.
Use current rates when calculating: corporation tax main rate changed to 25% for many companies from April 2023; dividend tax rates shown above applied in 2024/25.
If further help is needed, bring these numbers to an accountant: company surplus, expected timeline for funds, personal tax band and pension availability. That will speed advice.
NS&I Premium Bonds terms
A practical decision matrix helps translate horizon and risk tolerance into action. If you need cash within 0–3 months:
- favour corporate instant access or short notice business accounts to preserve liquidity and avoid extraction tax
- cash ISA liquidity is generally good only after extraction, and Premium Bonds expected return is probabilistic, so do not rely on prizes for short‑term needs. For 3–12 months: consider corporate term deposits or laddered short gilts to earn a predictable post‑corporation tax yield
- only extract amounts that fit personal allowances if you need tax‑efficient personal shelter quickly
For 1+ years and a goal of personal tax‑free returns: extract up to the personal ISA allowance (e.g. £20,000 for 2024/25) after modelling extraction tax. Then assess the remainder for corporate investment or staggered extraction.
If preserving capital with a chance of upside, compare the Premium Bonds expected return for your likely holding size against Cash ISA rates after extraction tax. That comparison, with your prize tolerance, should drive your choice.
