How to Budget for Buying a Business: A Step-by-Step Checklist

Buyers who lose deals at the finish line almost never lose them over the purchase price. They lose them because they budgeted for the price and forgot everything else: the down payment, the working capital reserve, the legal bills, and the cushion for the surprise that always shows up during due diligence. A real acquisition budget accounts for all four before you ever sign a letter of intent.

This guide walks through how to build that budget step by step, with current 2026 figures for each line item, a worked example on a typical main-street deal, and a decision framework for what to do if your number comes up short. For the full cost breakdown by fee type, see our guide to how much it costs to buy a business; this post focuses on the process of building your own budget and planning around it.

Key takeaways

• Your acquisition budget has four layers: the down payment, a working capital reserve, legal and due diligence fees, and a contingency buffer. Add them together, not just the purchase price.
• The SBA 7(a) minimum down payment is a 10% equity injection. As of SOP 50 10 8, effective June 1, 2025, a seller note can only cover half of that, and only on full standby for the entire loan term.
• Working capital is commonly planned at around 10% of purchase price as a starting estimate, but the real number is deal-specific and can run much higher for inventory or receivables-heavy businesses.
• Legal and due diligence fees for small deals typically land between 1% and 5% of purchase price, trending toward the higher end for smaller, sub-$10 million transactions.
• If you come up short, the order of operations is: renegotiate the price first, look for more financing second, and only reduce the scope of the deal as a last resort.

How much money do you actually need to buy a business?

The short answer: total cash needed equals your down payment (typically a 10% equity injection under SBA 7(a) rules) plus a working capital reserve (commonly budgeted around 10% of purchase price) plus legal and due diligence fees (roughly 3% to 5% for small deals) plus a contingency buffer, not the purchase price alone. On a $350,000 business, that stack lands in the neighborhood of $60,000 to $75,000 in total cash, even though the down payment alone is only $35,000.

That gap between the "10% down" headline and the real number is where most first-time buyers get caught off guard. The rest of this guide breaks down each layer so you can build your own number before you fall in love with a listing.

Start with the purchase price, but don't stop there

Every acquisition budget starts with an anchor number: what the business is likely to sell for. According to BizBuySell's Q1 2026 Insight Report, the median U.S. small-business sale price was $350,000 in the first quarter of 2026, on median cash flow (seller's discretionary earnings) of about $165,256 and median revenue near $713,404.

That purchase price is the input for every other line in your budget: the bigger the deal, the bigger the down payment, the working capital reserve, and (in dollar terms, though not always in percentage terms) the fees. Before you build a budget, get a realistic price range for the size and industry of business you're targeting. Our guide to the key metrics for evaluating a business acquisition walks through how to judge whether an asking price is justified by the underlying numbers.

Step 1: Your down payment, the SBA's 10% rule (and the seller-note catch)

For a business acquisition financed with an SBA 7(a) loan, the minimum equity injection is 10% of the total project cost. That is a floor set by the SBA, not a lender preference, so it applies regardless of which bank you work with. Many lenders ask for more, sometimes 15%, depending on the industry and how strong the cash flow is relative to the asking price.

For a deeper look at how buyers structure the down payment itself, including seller notes, investor equity, and rollover funds, see our guide to SBA 7(a) equity injection sources.

One more planning note for 2026: new SBA rules effective March 2026 require all 7(a) and 504 loan applicants to be U.S. citizens, which narrows the pool of SBA-eligible buyers compared to prior years. If you are not a U.S. citizen, confirm your financing path with a lender early, since it changes which parts of this budget apply to you.

Step 2: Working capital, the reserve that keeps the business running

This is the line first-time buyers skip most often. The business needs cash to operate from day one after closing: payroll, inventory, and the gap between when you pay suppliers and when customers pay you.

There is no single correct percentage. Working capital needs are deal-specific and are typically negotiated as a "peg," a target based on the business's trailing 6 to 12 month average net working capital, not a flat rule of thumb. As a starting planning estimate before you have deal-specific numbers, budgeting roughly 10% of the purchase price is a reasonable floor, but real deals range meaningfully higher, often 20% or more, for businesses carrying significant inventory or receivables. Lean service businesses with fast cash conversion can run lower.

Step 3: Legal and due diligence fees

Verifying the business is what it claims to be, financially and legally, is not optional, and it is not free. For small business acquisitions under $10 million, total due diligence spend (legal, financial, and operational review combined) typically runs $25,000 to $100,000, which works out to roughly 1% to 4% of deal value depending on deal size. Legal fees alone are commonly cited in the 1% to 5% range, trending toward the higher end for smaller, sub-$10 million deals.

For a main-street deal in the $300,000 to $500,000 range, that often means a legal and due diligence budget closer to 3% to 5% of the purchase price rather than the dollar figures quoted for larger transactions. The full checklist of what to verify, and roughly what each item costs, is in our due diligence checklist for buying a business.

Step 4: A contingency buffer

Every acquisition budget needs a fourth line that has nothing to do with a specific fee: a cushion for the things you did not anticipate. A financing delay that pushes closing costs higher. A landlord who wants first and last month's rent before assigning the lease. A piece of equipment that fails inspection. Budgeting a contingency of 10% to 15% on top of your other three layers is standard practice among experienced buyers, and it is the difference between a stressful surprise and a manageable one.

Worked example: budgeting to buy a $350,000 business

Here is how the four layers stack on a business priced at the current national median.

The down payment alone is $35,000, roughly a third of the total cash you actually need. That is the gap this guide exists to close: the headline "10% down" number and the real total are two very different figures, and only one of them will actually get you to a closing table.

What to do if you have a funding shortfall

Running the numbers above and coming up short is common, not a sign the deal is dead. Work through your options in this order:

1. Renegotiate the price or deal terms first. A lower price, a smaller working capital peg, or a larger seller note reduces every layer of your budget at once. This is the highest-leverage move and costs you nothing but a conversation.
2. Look for additional financing second. A larger full-standby seller note (up to half your equity injection), an investor or search-fund partner, or a home equity line of credit can close a gap without touching the deal itself. Rollover funds from a retirement account (a ROBS structure) are another common source, though they come with their own compliance requirements.
3. Reduce the scope of the deal as a last resort. If the price and the financing won't move enough, look at a smaller business, a partial buyout with the seller retaining equity, or an earnout structure that shifts part of the price to future performance instead of cash at closing.

A pre-LOI acquisition budget checklist

Before you submit a letter of intent, confirm you can check off each of these:

• You have a realistic purchase price range based on comparable deals in the industry, not just the asking price.
• You have calculated your minimum 10% equity injection in cash, without assuming a seller note will cover it.
• You have a working capital estimate, even a rough one, and know it will be refined once you see trailing financials.
• You have budgeted 3% to 5% of purchase price for legal and due diligence fees on a small deal.
• You have added a 10% to 15% contingency buffer on top of the first three layers.
• You know your fallback order if you come up short: price, then financing, then scope.
• Your total accessible capital, cash on hand plus anything you could reasonably raise, covers the full stack above, not just the down payment.

Budget with real listings, not guesswork

A budget only means something once you can point it at actual businesses for sale. That is where most first-time buyers hit a wall: pricing information is scattered across dozens of broker sites and marketplaces, none of which show cash flow, asking price, and location in one place. Clef aggregates 120,000+ business-for-sale listings from hundreds of brokers and marketplaces into a single searchable feed, so you can filter by price and cash flow and see, in real time, what your budget actually buys in the markets and industries you care about. Build the number in this guide, then go find out what it gets you.