What is a Locked Box: Fix your price, kill the slow bleed

You built this thing from zero. Now you’re thinking about selling it, and you want a clean exit without months of price arguments. People keep asking, “What’s a locked box?” It’s not obvious. But once you get it, you get leverage.

A quick story. A founder I worked with spent four months stuck in buyer spreadsheets, still haggling over tiny adjustments after signing heads. Every new line item shaved the price. We flipped the deal to a locked box. The noise stopped. The price stuck. He slept for the first time in weeks.

Why this matters

Every day between now and completion is risk. Markets wobble. Buyers shift. Small leaks become big discounts. If you don’t lock value now, your deal can bleed out slowly. A locked box freezes the price, moves the process forward, and stops the finish line from drifting away.

The simple answer: what a locked box is

A locked box sets the price using a past balance sheet date, usually a clean month-end. You and the buyer agree a fixed number off those final accounts. From that date to completion, the value inside the company is treated as the buyer’s. You promise no cash leaks out to you or related parties unless expressly permitted.

It has three parts:

• The locked box date: a historical cut-off with final numbers.
• A no-leakage covenant: your promise that no value leaves after that date except what you both permit in writing.
• Value accrual (the tick): zero, a simple interest rate, or a flat daily amount paid on top of the price to reflect time to completion.

No completion accounts. No endgame math brawl. The price is set. The rules are clear. If leakage happens, you pay it back, usually with interest.

Why founders like it

• Certainty. You can plan your life. You can look a buyer in the eye and say: here’s the number, here are the rules, let’s close.
• Speed. With a fixed price, legal and diligence work moves without a moving target.
• Fewer disputes. Everyone knows what counts as leakage, what’s permitted, and what happens if it leaks.
• Less accounting drama. Working capital and debt-like items are set at the locked box date, not re-fought after closing when your leverage is gone.

When a locked box fits your business

• Stable cash generation and solid monthly accounts? Perfect. Pick a clean month-end the buyer can trust and enjoy a smoother ride.
• Seasonal swings? Choose your date carefully and normalise sensibly. The wrong date hands value away; the right one does the opposite.
• High growth and burning cash? It can still work, but expect tougher questions on the tick. Buyers won’t pay for losses in the gap, come armed with a fair structure.
• Weak monthly packs? Fix them now. A locked box lives and dies on the quality of your numbers. If the buyer doesn’t trust your management accounts, they’ll push for completion accounts or a price cut. You want neither.

How to set it up like a pro

• Pick the right date. Use a finalised month-end with reconciled cash, clear debt, and normal working capital. Avoid outlier months, buyers smell heroics.
• Define leakage in plain English. Dividends, owner bonuses, related-party payments, fees to holdcos, shareholder debt repayments, list them. Then list permitted leakage: your agreed salary, specific bonuses, any pre-agreed distributions.
• Agree how value accrues. Interest on equity value, a per-day amount tied to expected cash generation, or zero if the gap is short. Keep it simple. Complexity invites doubt.
• Set clean reporting to completion. Agree the monthly pack you’ll share. Define ordinary course. You still run the business; you keep the buyer informed so trust holds. If something big changes, say it early. Surprises kill deals.

Risks to watch, and how to guard against them

• Leakage. Train finance. Circulate a red list of “do not pay” items after the locked box date without written consent. Keep a register of related-party payments. Small slips get expensive.
• Performance drift. If results dip, buyers push for a re-cut or walk. You can’t hide behind the structure. Protect key customers. Keep momentum. Don’t starve the engine.
• Debt-like items. Tax, deferred revenue, refunds, holiday pay, warranties, treat them cleanly at the locked box date. Be thorough now or pay later.
• Governance. Want to take cash out before closing? Put it in permitted leakage, in black and white. Hiring or firing senior people? Tell the buyer. Issuing options or changing bonuses? Align first. Control the narrative, or they’ll control the price.

The human side no term sheet shows

A locked box forces a choice: certainty now or the chance to squeeze a little later. Most founders are tired by the time real offers show up. They want to be done. A locked box is the path to done. It trades complexity for clarity and gets you home.

There’s dignity in it. You’re not playing spreadsheet games. You’re saying: here’s the business as it truly stands, here’s what a locked box means, and here’s how we protect both sides. Buyers respect that. It sets a fair tone that carries through diligence to the finish line. In a competitive process, it also lets you compare bids cleanly. Everyone prices the same package. The fuzz disappears.

Key takeaway

A locked box isn’t just a pricing tool. It’s a power move. It fixes value on your terms, stops the slow bleed, and turns the last miles from drama into execution. The seller who sets the rules shapes the outcome.

Your next step

If your locked box started this month, what would you clean, define, or decide today to make the number stick?

• Choose the date: pick the cleanest recent month-end with reconciled cash, clear debt, and normal working capital.
• Finalise the pack: lock management accounts, bank recs, aged AR/AP, tax balances, deferred revenue, provisions, and supporting schedules.
• Define leakage: list what’s forbidden and what’s permitted. Put your salary/dividends/bonuses, if any, in permitted leakage with amounts and dates.
• Set the tick: zero, daily amount, or simple interest. Tie it to expected performance and time to close. Keep it simple.
• Map debt-like items: taxes, refunds, accrued comp, leases, warranty/returns. Agree treatment and include schedules.
• Freeze related-party flows: set approval rules, train finance, and start a leakage register today.
• Agree reporting: monthly pack content, timing, and a short ordinary-course covenant. Flag any planned non-ordinary actions now.
• Lock working capital norms: document seasonality and any one-offs at the box date so there’s no post-close re-argument.
• Plan cash: forecast to completion so the business doesn’t starve and you don’t trigger avoidable leakage.
• Align the story: one clear narrative to the buyer about performance, pipeline, and any known changes. No surprises.

Do this, and you’ll sell on your terms, fixed value, clean process, headspace intact.