8 Clauses to Check in a Software Development Contract (2026): Scope, Acceptance, Payments and Termination

A software development contract decides most of the arguments a project can have before they start. Disputes in software projects rarely come from bad faith; they come from wording that let each side believe something different. Software is intangible, and what the client and the developer mean by 'finished' is often not the same thing. This guide explains, in plain language, the eight clauses we recommend checking before you sign and the phrases that should make you stop. It is general information, not legal advice; for large or data-heavy projects, have a lawyer review the contract. If you are still choosing a company, our list of outsourcing red flags is the right companion read.

Why does the software contract matter so much?

The contract is where 'what we agreed' stops being a memory and becomes a document both sides can point to. Writing down scope, time and price protects the client and the developer alike. Under Turkish law a software build with a defined deliverable is usually treated as a contract for work (eser sözleşmesi) under Article 470 of the Turkish Code of Obligations (TBK), in which the developer promises a result. That framing has practical consequences, such as the client's duty to inspect and report defects, which is why the clauses below matter. Projects without a contract, or with a vague one, are where scope drift, delays and payment disputes are most common.

1. Are scope and deliverables written clearly?

The scope clause should say what will be built and what will not. Replace general phrases like 'corporate website' with concrete items: the number of pages or screens, the modules, the integrations, the supported languages and the target devices and browsers. Listing what is out of scope matters as much as listing what is in, because it prevents the 'that was obviously included' argument later. Attach the brief or technical specification to the contract as an annex; our guide on writing a software project brief shows what it should contain. And state how scope changes will be priced before the first one arrives.

2. Who owns the source code and the intellectual property?

Ownership of the code needs an explicit written transfer; paying for the project does not move the rights on its own. Under Law No. 5846 (FSEK), computer programs are protected works, and Article 52 requires the transfer of economic rights to be in writing with each right listed. Look for wording that transfers the source code and all economic rights to you when payment is complete, and ask how the vendor's own reusable components and open-source libraries are licensed. We cover the articles, a 2020 Court of Cassation ruling and the exact clauses to write in our source code ownership guide, so here we keep it short: if ownership is vague, switching vendors later becomes very hard.

3. Are acceptance criteria and the test process defined?

Delivery and acceptance are different events, and the contract should define when work counts as accepted. Under TBK Article 474 the client has to inspect delivered work as soon as the ordinary course of business allows and report defects within a reasonable time, and under Article 477 defects that surface later must be reported without delay. A written acceptance process turns that duty into something manageable: how long the acceptance test runs, how defects are reported, and what happens next. A clause such as 'defects reported within 10 business days of delivery are fixed free of charge' makes the process clear. Use measurable criteria, such as a page-load target, supported browsers or a payment flow that completes successfully. Without them, acceptance depends on each side's opinion.

4. Is the payment plan tied to progress?

A healthy payment plan ties payments to milestones such as analysis sign-off, design delivery, a test release and go-live. Paying the full amount upfront is a serious risk, because it removes your bargaining power over delivery. On the other side, a vendor reasonably asks for an advance to protect its work. A workable balance is an advance, interim payments at milestones and a balance held back until after delivery. Also put in writing whether the price is fixed or hourly, and how VAT and invoicing work.

5. How do revisions and change requests work?

Every project changes; what matters is how changes are handled. The contract should state how many rounds of revisions are included and how out-of-scope requests are quoted. A written change request process protects the client from surprise invoices and the vendor from endless revisions. Every approved change should have its effect on price and timeline written down before work starts. That discipline prevents most of the tension that builds up in the middle of a project.

6. Are there confidentiality and personal data clauses?

Your software vendor can see your processes, customer data and trade secrets, so the contract needs a confidentiality clause and, where personal data is involved, data protection terms. The confidentiality (NDA) clause should prohibit sharing that information with third parties or using it for any other purpose. If the project processes personal data, the vendor is a data processor, and under Article 12 of Law No. 6698 (KVKK) the data controller is jointly responsible with the processor for taking the necessary security measures, so write those measures into the contract. Ask whether real customer data will be used in test environments. If servers or subcontractors abroad are involved, require that to be stated; our KVKK website checklist covers the site-side obligations.

7. How long is the warranty and post-launch support?

Define a warranty period during which defects found after launch are fixed free of charge, and separate it clearly from new feature requests. The contract should state how long the period lasts and what counts as a defect rather than a change. Long-term maintenance can be a separate contract; our website maintenance cost guide explains what it usually includes and costs. Make sure response time and resolution time are defined separately. A delivery with no warranty can leave you paying extra for the bugs that appear in the first month.

8. What are the termination and handover terms?

Neither side plans for a project to stop halfway, but the contract should. It should state when each party may terminate, and how work done up to that point is paid for and handed over. The clause that matters most is that the code and documents produced so far will be delivered to you. Having your own access to the code repository protects you against risks such as the vendor closing down or the team changing. Keep penalty clauses and late-delivery damages proportionate: under Article 22 of the Turkish Commercial Code, a merchant generally cannot ask the court to reduce an excessive contractual penalty the way TBK Article 182 otherwise allows, so a company that signs an inflated penalty may be held to it.

Which phrases are red flags?

Stop when you see scope left open with phrases like 'to be determined according to needs'. Full payment upfront, hints that the source code will not be delivered, or a termination right that only the vendor holds are serious warning signs. A contract with no acceptance criteria is as problematic as one promising 'unlimited revisions', because neither can be enforced in practice. A company that does not want a written contract at all is not one to trust with your project. For the wider selection process, see our guide on choosing a software company in Turkey.

What should you check before signing?

Before you sign, you should be able to answer six questions: what will be delivered and when, who owns the code and the rights, how 'done' is measured, which milestones the payments follow, what happens when scope changes, and who fixes problems and how fast. If the contract is long or the budget is significant, paying a lawyer to read it is a small cost next to the cost of a dispute. This article is general information and does not replace legal advice.