How to Evaluate Longer Customer Payment Terms: A CFO Guide

The sales director walks into the meeting with the kind of smile that usually means Finance is about to receive a surprise.

Our biggest customer wants more business.

Excellent.

They also want to move from net 30 to net 90.

Less excellent.

Apparently, we’ve expanded into commercial lending without telling the treasury team.

Sales calls it a strategic relationship concession.

I call it sixty additional days of paying suppliers, employees, freight bills, and possibly the electric company while someone else’s accounts payable department enjoys our hospitality.

Would I automatically say no?

Of course not.

But I would like to know when we decided that financing our customers was free, because I seem to have missed that meeting.

The First Question Isn’t About Revenue

When a customer asks for longer payment terms, the presentation usually starts with annual sales.

Big number.

Attractive growth rate.

Possibly a logo large enough to require its own slide.

I’d start somewhere less glamorous: what do we receive in exchange for the extra financing?

Is the customer promising additional purchases, or merely asking us to wait longer for money on orders we already have?

Those are two very different conversations.

One might be an investment in incremental contribution.

The other might be a discount dressed up as a calendar.

Before making a recommendation, I’d ask Sales for the existing contract, the proposed terms, actual payment history, purchase commitments, pricing concessions, and the customer’s forecast by month.

I’d ask Operations about inventory, production capacity, and any special handling required.

I’d ask Treasury about our marginal borrowing cost, revolver headroom, and minimum cash balance.

And I’d ask Credit whether the customer actually pays on day 30 today.

Because moving a customer from net 30 to net 90 sounds different when their current interpretation of net 30 is ‘whenever the invoice comes up in the next committee meeting.’

How to Evaluate Longer Customer Payment Terms

I’d build a decision model around incremental cash tied up, not just the sales margin.

For a steady stream of annual credit sales, a useful approximation is:

Additional average receivables = annual credit sales × additional collection days ÷ 365.

Then calculate the economic cost of that cash:

Annual financing cost = additional average receivables × marginal cost of funds.

The cost of funds might be the rate on incremental borrowing or a defensible opportunity cost of cash, depending on the company’s circumstances.

That isn’t the same as saying the entire receivable is an expense.

The principal is a working-capital investment; financing cost and expected losses affect the economics differently.

I’d add incremental credit losses, collection costs, any extra inventory carrying costs, and fees for financing or insurance.

Then I’d compare the total with incremental contribution from genuinely new business.

Not gross sales.

Not the sales team’s emotional attachment to the account.

Contribution.

The $6 Million Deal That Buys Us Absolutely Nothing

Here’s a hypothetical example, not a real client or company.

A customer buys $6 million annually, earns us a 30% contribution margin before financing costs, and currently pays in 30 days.

They request net 90 on the same $6 million, with no additional volume commitment.

The extra sixty days tie up approximately $986,301 in average receivables: $6,000,000 × 60 ÷ 365.

Assume a hypothetical 10% annual marginal cost of funds.

That’s about $98,630 in annual financing or opportunity cost.

Add an illustrative $15,000 for additional expected credit and collection costs.

We’ve just created roughly $113,630 of annual economic cost without selling one additional unit.

How exciting.

At that point I’d ask why the customer deserves a financing concession worth almost two percentage points of annual sales.

The approximate recovery is $113,630 ÷ $6,000,000, or 1.89% of existing sales.

If a price increase has no volume effect and adds no variable cost, increasing the annual invoice value by roughly that amount would offset the modeled annual cost at the original sales base.

In practice I’d rerun the financing calculation at the higher invoice value, because the price increase itself also increases the receivable.

Using that circular adjustment, the break-even increase is closer to 1.94% under these assumptions.

Small difference?

Sure.

But I’d rather find it in the model than have it show up as an unpleasant little surprise six months later.

And if Sales says a two-percent price increase would destroy the relationship, I’d ask why giving away nearly two percent is apparently harmless.

Now Give Me Something Worth Financing

Change the facts and I might change my answer.

Suppose the same customer will purchase $8 million annually, including $2 million of credible incremental orders, at the same 30% contribution margin.

That extra volume generates $600,000 in annual contribution before financing, credit, and other incremental costs.

At net 30, the original $6 million produces average receivables of approximately $493,151.

At net 90, $8 million produces approximately $1,972,603.

The difference is $1,479,452 of additional average receivables.

At 10%, that’s approximately $147,945 in annual financing cost.

Assume another $25,000 in incremental expected credit and collection costs.

The annual contribution after those modeled costs is approximately $427,055.

Now we have a business case.

Not a finished one.

An actual business case.

I still need to know whether the incremental orders require new inventory, overtime, freight, equipment, or capacity that displaces a better customer.

I also need to know whether that $2 million is contractual or merely described as ‘highly likely’ by someone who has already included it in the bonus forecast.

If it’s genuine, the concession could be sensible.

If it’s vapor, we’ve agreed to lend a customer money in exchange for a promising facial expression.

Three Offers I’d Put on the Table

1. Accept net 90, with protection.

I’d consider it if the customer commits to incremental purchases, credit quality is strong, the incremental contribution covers the risk-adjusted costs, and liquidity remains comfortable.

Set a credit limit, dispute-resolution process, and review date.

2. Counter with net 60 or staged payments.

Perhaps half the extension is enough.

Maybe a deposit, milestone invoice, or modest price adjustment solves the customer’s procurement problem without turning ours into a cash problem.

3. Keep net 30 and risk losing the growth.

That isn’t failure if the downside would jeopardize payroll, breach a covenant, or crowd out higher-return business.

Some revenue is simply too expensive to own.

I wouldn’t pick the compromise just because it sounds diplomatic.

The recommendation depends on incremental margin, financing cost, customer behavior, liquidity, and what else we could do with the same cash.

Sales may dislike hearing that a large order can be financially unattractive.

That’s fine.

Finance isn’t there to make the revenue slide feel loved.

The Part the Income Statement Won’t Warn You About

Even a positive annual contribution calculation can conceal a nasty cash trough.

I’d model weekly cash for the initial ramp and monthly cash after that, with receipts tied to actual payment behavior rather than the contractual due date.

For $8 million of annual sales, moving from day 90 to day 120 adds roughly $657,534 of steady-state receivables: $8,000,000 × 30 ÷ 365.

That’s additional liquidity exposure, not an immediate expense on the income statement.

Now layer in supplier payments, payroll, taxes, seasonal inventory, revolver limits, and the board’s minimum cash floor.

Then cut the promised incremental volume by 25% while assuming we’ve already purchased the supporting inventory.

Does the company still have room to breathe?

If not, I’d restructure the terms or refuse the deal regardless of how handsome the contribution margin looks.

An income statement cannot wire money to payroll.

I’ve checked.

What I’d Monitor After Signing

I’d give Sales and Finance one shared scorecard instead of two separate versions of success.

Track incremental orders actually received, contribution after concessions, average collection days, overdue balances, disputes, cash tied up, and the customer’s credit-limit utilization.

Review the first ninety days and then quarterly, with explicit triggers for renegotiation.

If volume falls short, payments slip, or the downside cash buffer disappears, the agreement needs another conversation.

Not another slide explaining that the partnership remains strategically important.

I already know the partnership is important.

I want to know whether it is paying for itself.

The Decision I’d Defend

I don’t object to net 90 on principle.

I object to treating net 90 as a harmless courtesy while Finance quietly finds the cash.

Price the concession.

Prove the incremental contribution.

Stress-test the liquidity.

Put commitments and review triggers in writing.

And if the economics don’t work, say so before the contract is signed, not after Accounts Receivable becomes the company’s most heavily funded department.

What’s the longest payment-term extension you’ve agreed to, and what finally convinced you the extra sales were worth financing?