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Invoice numbering has to be unique and unbroken. What a legal sequence looks like, which formats survive an audit, and how to fix a gap you already have.
Invoice vs receipt: one asks for money, the other proves it arrived. Why sending the wrong one causes double payments, and what each document must contain.
A proforma invoice commits to a price without creating a tax liability. When to send one, what it must say, and the moment it has to become a real invoice.
Are electronic signatures legally binding? Yes, in the US and EU, with conditions. What ESIGN and eIDAS require, the three EU tiers, and what stays excluded.
A retainer agreement answers three questions before they get expensive. The four models, the clauses that prevent arguments, and what unused capacity does.
Amendment vs addendum: one changes existing terms, the other adds new ones. Which you need, how renewal clauses fit, and why version history matters more.
A statement of work fails two ways: too vague to enforce, or long enough to be a second contract. The six sections it needs, and what belongs in the MSA.
A master service agreement settles the terms once, so each new project starts at the work. What belongs in it, what belongs in the SOW, and when to skip it.
Partial payments, bundled transfers and FX turn reconciliation into detective work. Here is why matching breaks and what it takes to close the last handoff.
Most late payments are not refusals, they are process failures on the client side. Here is a sequence that gets you paid without spending the relationship.
Agency billing breaks differently: mixed retainers and projects, pass-through costs, and scope captured too late. Here is how to bill without losing margin.
The handoff from an accepted proposal to an invoice is where scope quietly changes. Here is why it drifts, what it costs, and how to make the two agree.
Proposals, contracts, invoices and payments
Send proposals, contracts and invoices, and get paid. Your clients accept, sign and pay from your emails, and find every document in a portal with your name.
