Exclusive Rates From as Low as 0.26%
The main difference between a merchant account and a payment service provider (PSP) is ownership and control: a dedicated merchant account is a bank account in your business's own name, held with an acquiring bank, whereas a PSP such as Stripe, Square or SumUp processes payments through its own shared merchant account and simply passes the funds on to you. For UK businesses, the right choice depends on turnover, average transaction size, risk profile and how quickly you need access to funds - smaller and newer businesses tend to start with a PSP, while established businesses processing over roughly £10,000-£15,000 a month usually save money by moving to a dedicated merchant account. This guide compares the two models in detail so you can make an informed decision rather than defaulting to whichever option is easiest to sign up for.
Key Takeaways
- A merchant account is a dedicated bank account held in your business's name with an acquirer; a PSP aggregates you alongside thousands of other merchants under its own account.
- PSPs like Stripe, SumUp and Square offer same-day sign-up and flat-rate pricing, typically 1.4%-2.9% per transaction, with no monthly fees.
- Dedicated merchant accounts use interchange-plus pricing, usually 0.3%-0.8% above interchange, but carry monthly fees of £15-£35 and often a minimum monthly service charge.
- Businesses processing above roughly £10,000-£15,000 per month typically save money by switching from a PSP to a merchant account.
- PSPs are far more likely to freeze funds or hold reserves without warning, because underwriting happens automatically and reactively rather than upfront.
- High-risk or high-average-transaction-value businesses (travel, subscriptions, B2B, adult, gambling-adjacent) are often better served by a merchant account from day one.
- Many established businesses run a hybrid setup: a merchant account for core card-present or e-commerce volume, with a PSP kept as a backup or for occasional online sales.
What Is a Merchant Account?
A merchant account is an account set up specifically for your business by an acquiring bank (such as Barclaycard, Elavon, Worldpay or Global Payments) that allows you to accept and process debit and credit card payments. When a customer pays, funds settle into this dedicated account before being transferred to your business current account, usually within one to three working days. Because the account is unique to your business, the acquirer underwrites you individually, assessing your trading history, sector, average transaction value and refund rate before setting your pricing and risk terms.
You'll usually need a separate payment gateway (such as Opayo, Worldpay's gateway, or a card terminal provider) to connect your website or till to the merchant account. For a full explanation of how this works, see our guide on what a merchant account is.
How Underwriting Works
Merchant account underwriting is done by a human (or a semi-automated system reviewed by a human) before you're approved. Expect to provide company accounts or projected turnover, details of your products or services, your average and maximum transaction values, and evidence of your business's legitimacy. This upfront diligence is precisely why merchant accounts are more stable long-term - the acquirer already understands your risk profile before you process a single transaction.
What Is a Payment Service Provider?
A PSP is a third-party company that lets you accept card payments without needing your own merchant account. Well-known UK examples include Stripe, Square, SumUp, Zettle (PayPal) and Adyen. Instead of an acquirer opening an account in your name, the PSP holds one large master merchant account and processes payments for thousands of businesses through it, allocating your share of the funds to you after each settlement cycle.
This structure is what makes PSPs so quick to set up - often within minutes, using only basic company or sole trader details, with no contract negotiation and no credit check in the traditional sense. Pricing is simple and transparent, usually a flat percentage per transaction (for example 1.75% for card-present payments or 2.9% + 20p for online payments with some providers), with no monthly minimum and no long-term contract.
How PSP Risk Assessment Works
Because a PSP doesn't underwrite you properly before you start trading, it monitors your account algorithmically after the fact. If your transaction pattern looks unusual - a sudden spike in volume, a higher-than-usual average transaction value, or a cluster of chargebacks - the PSP's automated systems may freeze funds, hold a reserve, or close your account without much warning. This reactive risk model is the single biggest practical drawback of PSPs for growing businesses.
Merchant Account vs PSP: Side-by-Side Comparison
| Feature | Dedicated Merchant Account | Payment Service Provider (PSP) |
|---|---|---|
| Setup time | 3-10 working days (underwriting required) | Minutes to same day |
| Contract length | Often 12-18 months, some rolling | No contract, cancel anytime |
| Pricing structure | Interchange-plus, typically +0.3%-0.8% | Flat rate, typically 1.4%-2.9% |
| Monthly/service fees | £15-£35 per month plus PCI compliance fee | None (usually) |
| Settlement speed | 1-3 working days | 1-3 working days, sometimes longer for new accounts |
| Account freeze risk | Low - risk assessed upfront | Higher - risk assessed reactively |
| Best suited to | Businesses processing £10k+/month, high-ticket or B2B | Startups, low volume, seasonal or side businesses |
| Own bank account name on statements | Yes | No, PSP's name usually appears |
Cost Comparison at Different Volume Levels
Pricing structure is where the two models diverge most sharply. PSPs charge a flat percentage regardless of volume, which is simple but expensive at scale. Merchant accounts charge interchange-plus, meaning you pay the actual interchange fee (set by Visa/Mastercard, typically 0.2%-0.3% for UK consumer debit cards and higher for credit cards) plus a small margin, but you also pay fixed monthly costs regardless of how much you process. This means merchant accounts become cheaper as volume rises, while PSPs stay flat.
| Monthly card turnover | Estimated cost with PSP (avg 1.9%) | Estimated cost with merchant account (interchange + 0.4%, plus £25 monthly fee) |
|---|---|---|
| £3,000 | £57 | ~£43 (incl. monthly fee) |
| £8,000 | £152 | ~£82 |
| £15,000 | £285 | ~£130 |
| £40,000 | £760 | ~£290 |
| £100,000 | £1,900 | ~£665 |
These figures are illustrative and assume a typical blend of UK debit and credit cards; actual interchange varies by card type, and commercial or corporate cards attract higher rates. Even so, the pattern holds across almost every UK business we compare: below roughly £5,000-£8,000 a month, a PSP is often cheaper or comparable once monthly fees are accounted for, but above £10,000-£15,000 a month a merchant account nearly always wins on price. For a full breakdown of every charge you might see, read our guide to merchant account fees explained.
Speed of Payout and Cash Flow
Both models typically settle funds within one to three working days, but there are important differences in practice. New PSP accounts are sometimes subject to a delayed first payout (occasionally 7-14 days) while the provider builds confidence in the account. Merchant accounts, once approved, tend to settle on a consistent, predictable schedule from day one because the underwriting has already happened. If your business relies on tight cash flow - hospitality, trades, or retail with thin margins - this predictability can matter as much as the headline rate.
Risk of Funds Being Frozen or Held
This is the area most UK business owners underestimate. PSPs use automated fraud and risk-monitoring systems that can flag an account for unusual activity - a large single transaction, an unexpected spike in volume, a new product line with higher average order values, or a cluster of customer disputes. When this happens, the PSP may hold a rolling reserve (commonly 10-20% of turnover held back for 90-180 days) or freeze the account entirely pending review, sometimes with limited immediate explanation.
Dedicated merchant accounts are not immune to reserves, particularly for higher-risk sectors, but because the acquirer has already reviewed your business model, trading history and expected volumes during underwriting, sudden freezes are far less common. If your business has previously experienced a PSP freeze, or operates in a sector prone to it, a merchant account with proper underwriting is usually the safer long-term home. This is especially relevant for sectors covered in our high-risk merchant accounts UK guide.
Contract Terms and Flexibility
PSPs are pay-as-you-go with no contract, which suits businesses that are testing an idea, trade seasonally, or simply want the flexibility to walk away at any time. Merchant accounts typically involve a minimum contract term of 12 to 18 months, sometimes with an early termination fee if you leave before the term ends, though many acquirers now offer more flexible or rolling monthly terms to stay competitive. Before signing, always check the exit terms, notice period and any equipment lease attached to a terminal, since these often outlast the headline contract length. If you're already tied into a merchant account and considering a move, our step-by-step guide to switching merchant account covers how to do this without disrupting your payments.
Which Businesses Suit Which Model
PSPs Tend to Suit
- Startups and sole traders processing under £8,000 a month
- Businesses trading seasonally, such as market stalls or pop-up retailers
- Side businesses or those testing a new product line before committing
- Businesses that value simplicity and same-day setup over the lowest possible rate
Merchant Accounts Tend to Suit
- Established businesses processing more than £10,000-£15,000 a month
- Businesses with high average transaction values, such as B2B, travel, or professional services
- Businesses that have previously had a PSP account frozen or restricted
- Retailers and hospitality venues needing multiple terminals and detailed reporting
- Businesses in regulated or higher-risk sectors requiring specialist underwriting
For a curated look at options at the smaller end of the market, see our comparison of the best merchant accounts for small business UK.
The Hybrid Approach
A growing number of UK businesses run both models side by side rather than choosing one exclusively. A common pattern is to hold a dedicated merchant account for the bulk of transaction volume, where the lower interchange-plus rate delivers real savings, while keeping a PSP account active as a backup for occasional overflow, new sales channels, or as a contingency if the primary account is ever paused for review. This hybrid setup adds a small amount of admin but significantly reduces the risk of being unable to take payments if one provider has an issue.
How to Decide: A Practical Checklist
- Check your monthly card turnover. Below £5,000-£8,000, a PSP is usually simpler and cost-competitive. Above £10,000-£15,000, a merchant account will likely be cheaper.
- Review your average transaction value. Higher average transactions (£200+) tend to attract more scrutiny from PSPs and benefit more from merchant account underwriting.
- Consider your sector. If you operate in travel, subscriptions, high-value goods, or anything PSPs flag as higher risk, get quotes for a merchant account early.
- Factor in your growth plans. If you expect volume to double within a year, it may be worth setting up a merchant account now rather than switching under pressure later.
- Ask about contract flexibility. If you value the ability to leave instantly, weigh that against the cost savings a merchant account contract could deliver.
If you're setting up for the first time, our guide on how to open a merchant account in the UK walks through the documents and timeline involved.
Frequently Asked Questions
Is a PSP cheaper than a merchant account?
At low volumes, yes - a PSP's flat-rate pricing with no monthly fee often beats a merchant account once its fixed monthly costs are factored in. Once monthly card turnover passes roughly £10,000-£15,000, a merchant account's interchange-plus pricing usually becomes cheaper, since the margin charged on top of interchange is far lower than a PSP's flat rate.
Can I switch from a PSP to a merchant account later?
Yes, and it's a very common move as businesses grow. Most UK businesses can switch without any disruption to trading by running both accounts briefly in parallel during the transition; our guide on switching merchant account explains the process step by step.
Why did my PSP freeze my funds?
PSPs use automated risk monitoring rather than upfront underwriting, so unusual activity such as a sudden spike in volume, larger-than-normal transactions, or a rise in chargebacks can trigger an automatic hold or reserve. This is one of the main reasons growing businesses move to a dedicated merchant account, where risk is assessed properly before trading begins rather than reactively afterwards.
Do I need a merchant account and a gateway, or does a PSP include everything?
A PSP typically bundles the merchant account function and the payment gateway into one product, which is part of why it's simpler to set up. A dedicated merchant account usually requires you to separately arrange a payment gateway (for online sales) or a card terminal (for in-person sales) that connects to it.
Are PSPs safe for a growing business?
PSPs are safe and reliable for many businesses, but their reactive risk model means growing businesses can occasionally experience frozen funds or account reviews at exactly the moment volume is increasing. For businesses with predictable, growing turnover above £10,000-£15,000 a month, a merchant account generally offers more stability alongside the potential cost savings.
Which is better for a new business with no trading history?
A PSP is usually the more practical starting point for a brand-new business, since merchant account underwriting typically requires some trading history, projected turnover figures or company accounts. Many businesses start with a PSP and move to a merchant account once they have several months of consistent trading data to support an application.
Does a merchant account require a fixed contract?
Many UK merchant accounts do include a minimum contract term, commonly 12 to 18 months, though some acquirers now offer rolling monthly agreements without long lock-ins. It's important to check the exit terms and any separate terminal lease agreement before signing, as these can outlast the core processing contract.
How Compare Card Fees Can Help
Compare Card Fees is a free, independent advisory service. We compare rates from leading UK payment providers to find you the best deal available - no fee, no obligation.
Whether you are looking to reduce your card processing costs, switch provider, or understand what you are currently paying, our experts can help. Tell us about your business and we will find the best rates available.
