The typical way to compare invoicing programs is a features table. It's the most reliable way to choose badly, because almost all of them cover the essentials, and the differences that actually matter show up in no table at all.
What's non-negotiable in Portugal
Before any comparison, some requirements are not optional: the software has to be certified by the tax authority, it has to generate the SAF-T file correctly, and it has to report invoices as required. Any option that fails here is out, no matter how good it looks otherwise.
The questions that actually separate the options
- How does the data get out? The most important question, and the least asked. A program you cannot export your full history from, in a usable format, is a trap: it locks the company in through the difficulty of leaving, not through quality.
- Does it connect to what your accountant uses? An integration that avoids manual entry saves hours every month and cuts down mistakes.
- Who answers when something breaks? On the day you can't invoice, the difference between 48-hour email support and immediate phone support is what matters.
- What does it cost in three years? Price per user, per document issued, per module. The upfront cost is rarely the real cost.
- How long does migration take? Client history, items, open balances. It's always longer than expected.
The mistake of buying for the future
It's common to choose the tool that fits the company you expect to have in five years. You pay for complexity now, adoption is slower, and in many cases the company ends up using a fraction of the features — having paid for all of them.
A tool that serves the next two to three years well, and that's easy to leave, is almost always the better economic decision.
Test it with real data
A sales demo shows the ideal path. A real test does the opposite: take your company's three most complicated cases — the partial credit note, the client with tax withholding, recurring billing with variable scope — and check whether the program handles them without contortions.
This is also the stage where you find out whether the problem was really the tool. As covered in when spreadsheets stop being enough, a new tool creates no process on its own: if invoicing goes out late because there's no defined moment to invoice, it will keep going out late, with a monthly subscription added on top.