
Buying a business in Washington can feel exciting and stressful all at once. You may like the location, the numbers may look good, and the seller may seem trustworthy. Still, you need to slow down before you sign, wire funds, or agree to final terms.
Due diligence gives you a closer look under the hood. It helps you confirm what the seller has told you, understand what you are really buying, and spot issues before they become your problem. Below, we’ve compiled a due diligence checklist for business buyers in WA.
Why Due Diligence Matters
Due diligence protects you from surprises. A business may look strong from the outside, but hidden tax debt, weak records, customer concentration, lease problems, or outdated equipment can change the deal quickly.
This review also helps you make a smarter offer. You may confirm that the price makes sense, request better terms, ask the seller to fix issues before closing, or decide that the risk does not fit your plans.
Start With the Financial Records
First on the due diligence checklist for WA business buyers is the financial records. Ask for profit and loss statements, balance sheets, tax returns, bank statements, payroll records, sales reports, and debt schedules. Review at least three years when possible, and compare the records against each other.
Look for patterns that tell a bigger story. Revenue may rise while profit shrinks. Sales may depend on one busy season. Expenses may look unusually low because the seller runs personal costs through the company or does unpaid work that you will need to replace.
Confirm Cash Flow
Cash flow matters more than excitement. A business can show sales and still struggle to pay rent, payroll, vendors, taxes, and debt. Review how money comes in, when it comes in, and how much remains after normal operating costs.
Ask how the seller handles slow-paying customers, vendor terms, refunds, deposits, and owner compensation. If the business needs constant cash injections, you need to know that before you become responsible for it.

Check Taxes and Washington Successor Liability
Washington buyers need to pay close attention to taxes. In Washington, a buyer may become liable for the unpaid taxes of the business they’re purchasing. That means tax due diligence should happen before closing, not after.
Ask the seller for current tax filings, payment records, and any notices from tax agencies. You can also request a Tax Status Letter from the seller and consider using the Department of Revenue Successorship Notice process to reduce exposure.
Look Beyond Sales Tax
Do not stop with retail sales tax. Review business and occupation tax, payroll tax, excise tax, local obligations, and any industry-specific taxes that may apply. A restaurant, contractor, auto repair shop, or professional service firm may each carry different tax concerns.
Ask your CPA or tax advisor to review the records before closing. A small issue may need a simple fix, while a large unpaid balance may require escrow funds, a price adjustment, or a different deal structure.
Verify the Legal Entity and Ownership
Confirm that the seller has the legal right to sell the business. Check the entity name, registered agent, governing documents, ownership records, and authority to sign. For Washington entities, the Secretary of State business records can help you review public filing details.
This step matters because names can get confusing. A store may operate under a trade name while a separate LLC owns the assets. You need to know which entity owns the equipment, customer list, intellectual property, inventory, lease rights, and contracts.
Search for Liens and Legal Claims
Ask about loans, UCC filings, judgments, lawsuits, disputes, and unpaid vendors. A lien may follow business assets, and a legal claim may affect the company’s value or reputation.
Your attorney can help review lien searches, court records, contracts, and closing documents. You want clear title to the assets you buy and written answers about any disputes that could affect the business after closing.
Review the Lease and Location
For many Washington businesses, the lease can make or break the deal. A great business in a poor lease position may become much less attractive. Review the rent, renewal options, assignment rights, security deposit, maintenance duties, personal guarantees, and landlord approval requirements.
Do not assume the lease will transfer automatically. The landlord may need to approve you as the new tenant, and that process can take time.
Understand Property Costs
Base rent tells only part of the story. Review common area maintenance charges, insurance obligations, property tax pass-throughs, utilities, repairs, and future rent increases.
Examine Contracts, Customers, and Vendors
Contracts can create real value, but only when they transfer cleanly. Review customer agreements, vendor contracts, service agreements, software subscriptions, franchise documents, maintenance contracts, and any long-term commitments.
Check whether contracts require approval before assignment. A buyer may assume a key contract will continue, only to learn that the other party can cancel or renegotiate it after the sale.
Review Customer Concentration
A business with loyal customers can look appealing, but too much revenue from one or two accounts creates risk. Ask for sales by customer, repeat purchase patterns, customer churn, and any written or verbal commitments.
You should also learn how customers find the business. If most sales come from the seller’s personal relationships, you need a transition plan that helps preserve trust after ownership changes.

Inspect Operations and Equipment
The day-to-day operation tells you how the business really works. Review systems, procedures, equipment lists, inventory practices, supplier relationships, licensing needs, technology, and training materials. Walk through the business when appropriate, and ask practical questions about staff duties, machine and equipment condition, workflows, and more.
Review Inventory and Assets
If inventory comes with the sale, check quality, age, quantity, and resale value. Old, damaged, obsolete, or slow-moving inventory should not receive the same value as clean, current inventory. Ask for purchase records, maintenance history, warranties, serial numbers, and loan information.
Evaluate Employees and Management
Employees can carry much of the value of a small business. Review job roles, wages, benefits, tenure, schedules, payroll records, contractor arrangements, employee handbooks, and any past or current employment disputes.
Pay close attention to key staff. If one manager runs most operations, you need to understand whether that person will stay. If the seller handles everything personally, you need to plan for training, hiring, or a longer transition.
Confirm the Transition Plan
A good transition plan can protect the value you just bought. Ask how long the seller will stay, what training they will provide, which relationships they will introduce, and how they will help explain the ownership change.
Put the transition details in writing. Include timing, responsibilities, access to records, customer introductions, vendor handoffs, and any consulting arrangement after closing.
Buy With Clear Eyes
Due diligence does not remove every risk, but it helps you buy with clearer expectations. When you review finances, taxes, contracts, leases, employees, operations, and compliance before closing, you give yourself a better chance to protect your investment.
If you are preparing to buy a business and are looking for experienced brokers in Seattle, Washington to help you in the process, look no further than Sound Business Brokers. Our team of Washington business brokers can help you navigate the complex details of due diligence so you can move forward with confidence.