Is it cheaper to borrow or use my own cash?

2 min read

Cash = no interestCheapest on paper

Borrowing = liquidityBuffer preserved

Value of a bufferReal, not zero

Depends on reservesThin vs ample

The obvious answer, and why it's incomplete

On paper, using your own cash is cheaper — you pay no interest. But that ignores what the cash is worth to you as a buffer and as dry powder for opportunities. Emptying your reserves to avoid interest can leave you exposed to a shock or unable to seize a deal, and the cost of that can dwarf the interest you saved. The honest comparison is interest cost versus the value of liquidity.

When to use your own cash

Using cash makes sense when you have genuine surplus above a healthy buffer, and no near-term use for it that would earn more than the interest you would save. Spending idle money to avoid borrowing cost is efficient. The test is 'idle' — cash that is truly spare, not cash you are pretending is spare because reserves feel comfortable today.

When to borrow instead

Borrowing is the wiser choice when using cash would leave your buffer thin, when the interest is modest and tax-relieved, or when keeping cash free lets you capture opportunities worth more than the interest. For many businesses the answer is a blend: use some surplus, borrow the rest, and keep the buffer intact. See how a loan reshapes cash flow.

Model the borrowing cost on the true cost calculator to see exactly what you would be paying to keep your cash. If borrowing wins, apply.

Frequently asked questions

Isn't using my own cash always cheaper than borrowing?

In direct interest terms, yes — cash costs no interest. But it is not free: spending reserves removes your buffer against shocks and your ability to seize opportunities, and that lost liquidity has real value. If using cash would leave you thinly covered, borrowing at a modest, tax-relieved rate can be the wiser choice despite the interest. Weigh the interest saved against the value of staying liquid.

Should I use some cash and borrow the rest?

Often the best answer. Blending your own surplus with borrowing lets you reduce the amount financed — and so the interest — while keeping a healthy buffer intact. You get some of the cost saving of using cash without the exposure of emptying your reserves. Decide the buffer you want to keep, deploy genuine surplus above it, and borrow the remainder.