Tech Invoice Template

Free Blockchain Developer Invoice Template

Invoice clients for smart contract development, Web3 applications, and blockchain integrations. Professional invoices from Tidybill.

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What is a Blockchain Developer invoice?

A blockchain developer invoice covers work building decentralised applications (dApps), smart contracts, Web3 integrations, NFT platforms, and blockchain infrastructure. Blockchain developers work with networks such as Ethereum, Solana, Polygon, and others, writing smart contracts in Solidity, Rust, or other platform-specific languages, and building the web frontend that interacts with on-chain systems. Blockchain development is highly specialised, commands premium rates, and involves unique risks including gas costs, smart contract bugs that are permanent once deployed, and rapidly changing tooling. Invoices should clearly describe the blockchain network used, the smart contracts delivered, the audit status of deployed code, and any ongoing monitoring or maintenance scope. Gas costs for deployment and testing are pass-through expenses that should be itemised separately.

What to include on a Blockchain Developer invoice

Common blockchain developer invoice line items

Service Typical Rate Unit
Blockchain development (day rate) 800 day
Smart contract development (ERC-20/ERC-721) 3000 contract
dApp frontend development 4000 project
Smart contract security audit 3000 audit
Web3 integration (wallet + contract) 1500 project
Gas costs for deployment (reimbursable) 200 deployment

How to invoice as a blockchain developer

For smart contract projects, invoice at milestones: contract written, tests passing, audit complete, deployed to testnet, deployed to mainnet. Never deploy to mainnet before audit if the contract handles significant value. Invoice gas costs as reimbursable expenses at actual cost. Net 14 payment terms. If you accept payment in cryptocurrency, note this in the contract and convert to GBP for invoice purposes to simplify tax accounting.

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Frequently asked questions

Should I accept crypto payment for blockchain work?
You can, but for UK tax purposes you must record the GBP value at the time of receipt and report it as income. Invoice in GBP to avoid exchange rate complexity, and accept crypto only if the client specifically requests it with a clear conversion mechanism agreed.
How do I handle smart contract security?
Recommend a professional security audit before mainnet deployment for any contract handling user funds. Budget the audit cost into the project. Your contract should state that deployment without an audit is at the client's risk.
What are gas costs and how do I pass them through?
Gas is the fee paid to the blockchain network for deploying and testing contracts. These are real costs that vary with network congestion. Pass them through at actual cost with transaction hashes as receipts.
How do I price a smart contract audit?
A basic audit by a professional firm costs £3,000-£10,000+ depending on contract complexity. If you perform your own security review, invoice this as a separate line item at your hourly rate.
Do blockchain developers need specialist insurance?
Smart contract bugs can cause irreversible financial loss. Standard professional indemnity insurance may not cover crypto-specific losses. Check your policy wording carefully and consider specialist tech PI cover.
Can I use this template for free?
Yes. Tidybill's free plan lets you create up to 5 invoices per month at no cost, with no credit card required. You can use the Blockchain Developer invoice template straight away after signing up.
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