Platform · Finance & billing
Bill the way C&I solar actually pays.
A commercial solar contract does not pay on “invoice sent”. It pays on milestones hit, on percent complete certified line by line, with retainage held back and taxes routed to the right authority in the right currency. Voltara’s finance module is built around that reality — four billing methods, retainage on the invoice itself, and a tax engine that knows Egypt is not Saudi Arabia.
4
billing methods — milestone, SOV, cost-plus, T&M
6
currencies on invoice lines — EGP · SAR · AED · JOD · USD · EUR
204
smoke tests gate every release — billing maths included
§01 · FOUR BILLING METHODS
Four billing methods, because contracts differ
Pick the method per project and the module shapes the invoices, the retainage and the paper trail around it. The billing method is a contract decision recorded once — not a workaround rebuilt in a spreadsheet every month.
Milestone draws
Fixed-price draws hung off the project’s delivery states — mobilisation, mechanical completion, commissioning. The schedule lives with the project, so billing follows the build instead of chasing it.
Progress against a schedule of values
AIA-G703-style line-item draws. Each application bills percent complete per line, with billed-to-date carried forward automatically — application four knows exactly what one to three already billed.
Cost-plus
Bill recorded cost plus the agreed markup. The invoice is built from the project’s actual cost record — vendor bills, subcontract certificates, payroll — not from a retyped estimate.
Time & materials
T&M runs on the same cost-plus engine: labour and materials as recorded on the project, billed with the agreed uplift.
The schedule-of-values grid
- Line-item draw applications in the AIA-G703 idiom: scheduled value, work this period, billed-to-date, balance to finish — per line, per application.
- Balance-to-finish guards refuse an over-billed line before the client’s quantity surveyor does.
- The draw becomes the invoice: one pass from certified percent complete to a numbered, taxed, retainage-aware document.
§02 · RETAINAGE & CHANGE ORDERS
Retainage held — and released — on the invoice itself
Most software treats retainage as a memo field someone remembers at the end of the job. Here it is invoice arithmetic: held per line as you bill, released on the same document when the contract says so.
- Retainage is withheld per line on each draw — the invoice shows gross, retained and payable, so the client’s copy and your ledger agree to the pound.
- Release happens on an invoice too: a release line on the same document, in the same numbering, not a side spreadsheet reconciled at handover.
- Change orders are gated on a client signature — until it is signed, the schedule of values does not move. Once signed, the change order appends to the SOV and its lines bill like any other.
- Change orders apply to the fixed-price methods — milestone and SOV — where a scope change moves the contract sum.
§03 · THE TAX ENGINE
VAT, withholding and currency — routed per jurisdiction
Set the project’s jurisdiction once in Setup & Legal and the tax engine follows: the right VAT rate on the invoice, the right withholding on the vendor bill, the right currency on every line.
14%
VAT — Egypt
15%
VAT — Saudi Arabia
5%
VAT — UAE
16%
VAT — Jordan
- Egyptian withholding runs at 3–10% by vendor category, applied on the bill — and the platform produces the WHT certificate your vendor will ask you for.
- Invoice lines bill in EGP, SAR, AED, JOD, USD or EUR — multi-currency at line level, not one header currency forced across the whole document.
- Stated plainly: Egypt is validated in production use. Saudi Arabia and Jordan are in validation; UAE (Abu Dhabi and Dubai) is preliminary.
§04 · EGYPT E-INVOICING
Egypt e-invoicing, stated precisely
Tax compliance claims should be worded carefully, so here is ours, exactly:
Voltara generates ETA-compliant e-invoices with QR codes — submission to the government gateway is on the integration roadmap. The e-invoice document is produced from the same record as the commercial invoice, so the figures cannot drift between the two.
E-invoice generation is Egypt-only today. Other jurisdictions are on the roadmap — not claimed.
§05 · AR / AP / P&L
Receivables, payables and a P&L the documents add up to
Client invoices, receipts, vendor bills and payment vouchers post to one project record — so the per-project P&L you read is the one the paper actually supports.
- AR and AP in one place: invoices and receipts on one side, bills and payment vouchers on the other — each producing its own PDF from the record.
- Void cascades keep the ledger honest: void a document and everything hanging off it follows, instead of orphaned receipts propping up a number nobody can reproduce.
- Per-project P&L from actuals — what was billed, what was spent, what is still held in retainage.
- Payroll posts across the bridge from HR, so labour cost lands in the project P&L without a month-end retype.
§06 · WORKS WITH
Where the money meets the rest of the record
Finance bills what the other modules prove. These are the proofs.
Procurement & subcontractors
The AP side feeds from here — three-way-matched supplier bills and ITP-certified subcontractor claims arrive in finance ready to pay.
Projects & delivery
Milestone billing hangs off the 8-state project machine — invoices follow audit-logged delivery states, not optimistic emails.
HR & payroll
The payroll→finance bridge posts labour cost into the project P&L, with jurisdiction labour rules — end-of-service included — applied upstream.
HONEST SCOPE
Voltara is project finance for EPC delivery — billing, retainage, taxes and the project ledger. It is not a general-ledger accounting replacement: your statutory books stay with your accountant. And e-invoice generation is Egypt-only today; other jurisdictions are on the roadmap, not claimed.
See a draw application priced, retained and taxed in one pass.
Demos are founder-led. Bring a real contract — we’ll set up its schedule of values and walk one draw from certified percent complete to a payable, numbered invoice.
Book a demo On the EPC Platform plan — $899/mo
Finance & billing ships on the EPC Platform plan at $899/mo (10 seats). The billing methods exist because the founder’s own NREA-licensed EPC arm signs these contracts and runs them on the platform daily.