Just Because You Can Pay Cash Doesn't Mean You Should

In my previous article, "Is Borrowing Cheaper Than Paying Cash?", I explored how the true cost of paying cash isn't always as straightforward as it first appears. The decision isn't simply about avoiding interest, it's about understanding the opportunity cost of tying up your own capital.

This article takes that idea one step further.

What if the question isn't whether you can afford to pay cash, but whether you should?

Every turn brings a higher view

The hidden cost of paying in full

Many businesses have sufficient funds to pay their Self Assessment tax, Corporation Tax or annual insurance premium outright.

So they do.

The payment is made, the liability disappears and the bank balance takes an immediate hit.

On paper, everything looks sensible. In reality, the business has just converted a healthy cash reserve into... nothing.

That cash is no longer available to invest in marketing, replace equipment, take advantage of supplier discounts or simply provide peace of mind should an unexpected expense arise.

The real cost isn't always the interest you avoid—it's the flexibility you lose.

A practical example

Imagine a Self Assessment tax liability of £10,000.

Using finance over six months might look like this:

• Tax liability: £10,000

• Monthly repayment: £1,726.55

• Total interest payable: £359.30

• Total repayment: £10,359.30

• Equivalent flat rate: 3.59%

At first glance, paying an extra £359.30 in interest may seem unnecessary.

However, if the £10,000 remains within the business and simply earns a modest 3.5% return, it could generate approximately £175 over the same period. That effectively reduces the net cost of financing to around £184.30, while allowing the business to retain access to £10,000 of working capital throughout the six months.

The hidden challenge: rebuilding your cash reserves

There's another factor that's often overlooked.

If you pay the £10,000 tax bill today, how long will it really take to build those savings back up?

Most business owners would like to think the answer is six months, but in reality, it is often much longer.

Every month brings new demands on cash. Marketing opportunities arise, salaries increase, unexpected costs appear, and another tax bill is never far away. Before long, the money that was supposed to replenish your savings has been absorbed by the normal demands of running a business.

As a result, paying a large liability in one lump sum can leave your business operating with reduced cash reserves for many months, or even years.

Finance changes that picture completely.

Instead of allowing your £10,000 reserve to disappear, you retain it while repaying the liability over six months. At the end of the finance agreement, the debt has been cleared, but your £10,000 reserve is still there, potentially having earned interest or generated returns within the business throughout that period.

Rather than spending the next year trying to rebuild your savings, you've protected them from the outset.

"The real choice isn't simply between paying cash or paying interest. It's between reducing your cash reserves today or preserving them for the future."

What if your business earns more than the cost of borrowing?

The argument becomes even stronger when you consider how efficiently your business uses its capital.

According to the Law Society Financial Benchmarking Survey 2026, prepared by Hazlewoods Accountants, the median Return on Capital Employed (ROCE) for participating law firms was 41.50%.

ROCE measures how effectively a business generates profits from the capital invested in it. Whilst this is different from earning interest on cash held in a savings account, it demonstrates an important principle: successful businesses often generate returns on their capital that are significantly higher than the cost of borrowing.

If your business is capable of generating returns well in excess of the finance cost, then retaining capital within the business can make commercial sense. Every pound kept available has the potential to support profitable activity, strengthen liquidity and create opportunities that would otherwise be missed.

Viewed this way, the question should not simply be:

"How much interest will I pay?"

It should be:

"What return could my business generate if I kept hold of this capital instead of paying it away today?"

A different way of thinking

Finance shouldn't always be viewed as something businesses use because they don't have the money.

Often, the opposite is true.

Many successful businesses use finance because they do have the money but they understand the value of keeping it.

Instead of allowing a tax payment or insurance premium to reduce carefully built cash reserves, they preserve liquidity, spread the cost over time and allow their capital to continue working for them.

Sometimes, the cheapest way to pay a bill isn't the option with the lowest interest cost. It's the option that leaves your business in the strongest financial position six months later - with the liability cleared and your cash reserves still intact.

About the author

Gemstone Legal is an independent finance broker that helps law firms to explore funding opportunities that can funding needs while protecting the cashflow of the business.

Get in touch at https://calendly.com/gemstonelegal/lawfirmfinancing