Invoice INV-2026-014 backup
The signed contract, approved estimate, and timesheet attached to that invoice's record.
Receivables · Supporting documents
Keep every invoice's supporting documents filed with it
When a client questions an invoice — 'we never approved that', 'what hours is this for?' — the answer is in your contract, estimate, or timesheet, but only if you can find it fast. Scattering those documents across email and drives means a simple query turns into an hour of digging. Cash Workspace lets you attach each invoice's supporting paperwork directly to its record, so the backing documents are one click away.
The problem
Why invoices need their backing paperwork attached
An invoice is just a number until you can show what stands behind it. When the supporting documents live elsewhere, a routine question becomes a scramble.
- A client disputes the scope and the signed contract is buried in an old email thread.
- An hourly invoice is questioned and the timesheet is in a different app entirely.
- The amount doesn't match the client's memory and you can't find the approved estimate.
- Delivery is disputed and the delivery note or sign-off isn't filed anywhere obvious.
- Your accountant asks what an invoice covered and the backing docs are scattered.
The workflow
Attach the backing documents to each invoice
When you create an invoice, gather the paperwork that supports it and attach it to the record right then.
- 1
Identify what backs the invoice
For each invoice, decide which documents prove it: the signed contract, the approved estimate, a timesheet, or a delivery note.
- 2
Attach them to the record
Attach those documents to the invoice's record so the invoice and its proof live together, not in separate places.
- 3
Name them clearly
Use clear filenames like 'ACME-contract-signed' or 'Apr-timesheet' so the right document is obvious at a glance.
- 4
Keep it consistent
Do this for every invoice, so a client query always has the same kind of answer ready.
- 5
Pull it instantly when asked
When a client questions an invoice, open its record and the contract or timesheet is right there.
Record structure
What to attach for each invoice
A consistent set of supporting documents per invoice turns any dispute into a one-click answer.
- Signed contract
- The agreement that authorized the work, so scope questions are settled fast.
- Approved estimate or quote
- What the client agreed to pay, so amount disputes have a reference.
- Timesheet
- For hourly work, the hours behind the invoice total.
- Delivery note or sign-off
- Proof the work was delivered or accepted, for delivery disputes.
- Change orders
- Any approved changes that affected the scope or amount.
- Invoice number
- The invoice each set of documents backs, kept consistent.
- Note
- A short line on what the documents prove, e.g. 'covers Mar–Apr design hours per CO-2'.
Example setup
An example backup-document setup
One way to organize invoice backup inside your workspace.
Contracts
Signed agreements per client, linked to the invoices they authorize.
Timesheets
Hour logs attached to the hourly invoices they support.
Delivery notes
Sign-offs and delivery confirmations filed with their invoices.
Common mistakes
Mistakes to avoid
- Leaving the contract in email so a scope dispute means a long search.
- Storing timesheets in a separate app disconnected from the invoice.
- Using vague filenames so you can't tell which document backs which invoice.
- Attaching backup to some invoices but not others, so coverage is patchy.
- Forgetting change orders, so an over-PO amount looks unjustified.
How it helps
How Cash Workspace helps
Attach docs to the record
Attach the contract, estimate, timesheet, and delivery note straight to each invoice so proof travels with it.
One click to the proof
Open an invoice and its backing paperwork is right there when a client questions it.
Per-invoice folders
Keep each invoice's supporting documents together so coverage is consistent.
Clear notes
Note what the documents prove so anyone reviewing the invoice understands the backup.
Related
Related document workflows
Disputed invoice notes
Keep notes and backup together when a client disputes an invoice.
Payment confirmation attachments
Attach proof of payment alongside the invoice's backup.
Business receipt organizer
Organize receipts and supporting documents in one place.
Send documents to accountant
Hand over invoices with their backing paperwork attached.
All finance workflows
Browse the full Cash Workspace workflow library.
FAQ
Invoice backup FAQ
- What documents should I attach to an invoice?
- Whatever proves it: typically the signed contract, the approved estimate, a timesheet for hourly work, and a delivery note or sign-off. Attach the ones that would answer a client's most likely question.
- Does Cash Workspace pull data out of my contracts or timesheets?
- No. The workspace stores and organizes the files you attach and leaves their contents untouched. You decide which documents back each invoice and what they prove.
- How does this help in a dispute?
- When a client questions an invoice, you open its record and the contract, estimate, or timesheet is attached right there, so you can answer with the actual paperwork in one click.
Organizing help — not tax, accounting, or legal guidance
Cash Workspace is a free workspace for organizing invoices, expenses, receipts, clients, and documents. This page is organizing guidance only — not tax, accounting, legal, or bookkeeping guidance. Cash Workspace does not connect to your bank, does not scan or read your receipts for you, and does not move or collect payments. Whether an expense is deductible depends on your situation, so confirm it with a qualified accountant or tax professional.
Keep every invoice's proof one click away
Start a free workspace and attach each invoice's contract, estimate, and timesheet to its record, so a client question is always answered with the actual paperwork.