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  • Intake formCollect details from a potential customer and continue yourself to a lead
  • LeadsTrack potential customers through to a quote and won work
  • Client portalShare quotes, contracts, invoices and project information with your client
  • QuotesCreate, send and convert a quote into an invoice
  • ContractsService agreement with digital signature
  • Assignment checkIs a job worth it? Check before you say yes

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  • ProjectsFrom signed contract to a project with time and costs
  • Project tasksTasks, deadlines and logged hours inside a project
  • Project profitabilityInvoiced and collected revenue, direct costs and margin on one project
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Invoicing & admin

  • InvoicesInvoices with Dutch VAT, numbering and PDF
  • Recurring invoicesDraft invoices generated monthly, quarterly or yearly
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  • ExpensesBusiness costs with VAT, category and receipt
  • Purchase invoicesKeep supplier invoices with their file attached
  • Bank CSV importImport a statement and match payments to invoices

Tax & bookkeeping

  • Financial overviewIncome, expenses and open invoices per period or client
  • Tax calculatorIndicative estimate of tax and net income
  • Bookkeeper packageExport and secure share link for your bookkeeper
  • Hourly rate calculatorFree: work out the hourly rate you need
  • Hours criterion calculatorFree: do you reach the 1,225 hours for entrepreneur deductions?

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  • Multilingual invoicesDocuments in 7 languages, set per client
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  • Freelancers (ZZP)
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←Home

Clients & sales

  • Client managementClient details, company and VAT numbers, payment terms
  • Intake formCollect details from a potential customer and continue yourself to a lead
  • LeadsTrack potential customers through to a quote and won work
  • Client portalShare quotes, contracts, invoices and project information with your client
  • QuotesCreate, send and convert a quote into an invoice
  • ContractsService agreement with digital signature
  • Assignment checkIs a job worth it? Check before you say yes

Work & projects

  • ProjectsFrom signed contract to a project with time and costs
  • Project tasksTasks, deadlines and logged hours inside a project
  • Project profitabilityInvoiced and collected revenue, direct costs and margin on one project
  • Time trackingLog hours per client or project and bill them
  • Mileage logKeep business trips with a rate per kilometre
  • Products & servicesSave price and VAT once, reuse everywhere

Invoicing & admin

  • InvoicesInvoices with Dutch VAT, numbering and PDF
  • Recurring invoicesDraft invoices generated monthly, quarterly or yearly
  • Payment remindersReminders before and after the due date
  • ExpensesBusiness costs with VAT, category and receipt
  • Purchase invoicesKeep supplier invoices with their file attached
  • Bank CSV importImport a statement and match payments to invoices

Tax & bookkeeping

  • Financial overviewIncome, expenses and open invoices per period or client
  • Tax calculatorIndicative estimate of tax and net income
  • Bookkeeper packageExport and secure share link for your bookkeeper
  • Hourly rate calculatorFree: work out the hourly rate you need
  • Hours criterion calculatorFree: do you reach the 1,225 hours for entrepreneur deductions?

Documents

  • Multilingual invoicesDocuments in 7 languages, set per client
  • CV makerFreelance CV or portfolio with a shareable link
View all tools

Popular

  • Freelancers (ZZP)
  • Construction
  • Cleaning
  • Consultants
  • Coaches
View all industries
SSmartWerk
  1. Home
  2. Who it’s for
  3. Developers

Administration for developers: check the assignment, keep hours, store costs

Developers

You work by the hour or day for changing clients. SmartWerk keeps contract, hours, software costs and a tax indication together.

Start for freeView pricing

Start free, no credit card.

Project
You keep per hour€ 48.70Accepted
01

A self-employed developer often works through an intermediary or directly for a company, hourly or at a day rate, and sometimes for several clients at once. The assignments pay well but carry risks: an unclear relationship with the client, hours that are not recognised and tooling costs you carry yourself.

02

SmartWerk puts the emphasis on those points. With Assignment check you check the rate, a contract records the agreements, a project keeps hours together and purchase invoices keep your subscriptions. For tax there is an indicative estimate. This is not a legal assessment of your assignment.

Where it goes wrong in practice

  • A rate you do not work through

    A good hourly rate disappears against unpaid hours, a gap between assignments and your own costs.

  • A relationship that resembles employment

    If the collaboration mainly feels like employment, you want to record it carefully and have it assessed.

  • Subscriptions and tooling

    Editors, hosting, cloud and test devices cost money every month. The invoices vanish in your mailbox.

  • Hours you must be able to show

    With an intermediary or a company you want to show what you did when, by project and by day.

How a job moves through SmartWerk

Every step is an existing SmartWerk feature; click through for the details.

  1. 1

    Check the rate

    Work out what an assignment yields per hour. This is an indication.

  2. 2

    Assignment agreement

    You record the agreements and have your client sign them.

  3. 3

    Project per client

    A project to which you link hours.

  4. 4

    Hours per day

    Record hours worked, per client and per project.

  5. 5

    Subscriptions and tooling

    Invoices for software, hosting and equipment with the file attached.

  6. 6

    Invoice for the period

    Make the invoice from your hours.

  7. 7

    Tax indication

    An estimate of tax and net income.

  8. 8

    Handover to your bookkeeper

    A package with invoices and VAT overview.

The tools that matter most here

  • Assignment checkAn indicative check of what an assignment leaves per hour.Is a job worth it? Check before you say yes
  • ContractsA contract records the agreements; on false self-employment read our checklist.Service agreement with digital signature
  • ProjectsA project per client keeps hours together.From signed contract to a project with time and costs
  • Time trackingHours per client, per day and per project.Log hours per client or project and bill them
  • Purchase invoicesPurchase invoices for software, hosting and equipment, with the file kept.Keep supplier invoices with their file attached
  • Tax calculatorAn indication of tax and net income.Indicative estimate of tax and net income
  • Hourly rate calculatorA free calculator to see which hourly rate you need.Free: work out the hourly rate you need
  • Client portalA client sees the contract, project status and invoices for the assignment through one link, handy for long-running assignments.Share quotes, contracts, invoices and project information with your client

Why this fits SmartWerk

01

Check and record

Assignment check and the contract are at the start of the chain. That suits work where the agreements matter as much as the hours.

Contract2026-007 Signed
MDMeridian DesignScope: Website redesign
Sanne Jansen02-10-2026M. Bos03-10-2026
Create invoiceStart project
02

Tooling as a register of its own

Purchase invoices are a separate register. Software and hosting sit neatly together, without changing your Expenses or the profit on the dashboard.

Contract2026-007 Signed
MDMeridian DesignScope: Website redesign
Sanne Jansen02-10-2026M. Bos03-10-2026
Create invoiceStart project
03

An indication, not advice

The tax calculator gives an indicative estimate. SmartWerk is not a tax adviser and does not claim to be.

SSStudio SanneKvK 84726193 · NL002187364B21Invoice2026-041
ClientBakkerij Van DijkDue date22-10-2026
Website onderhoud8 × € 85€ 680.00
Fotografie productpagina’s1 × € 320€ 320.00
Subtotal€ 1,000.00VAT 21%€ 210.00Total€ 1,210.00
NL91 ABNA 0417 1643 00

Example — fictional

A backend developer with two clients

Example: a backend developer receives an offer via an agency. He first works out in Assignment check what it yields per hour and records the agreements in a contract.

He keeps his hours in a project and stores the invoice for his hosting as a purchase invoice. Once a quarter he looks at the indicative tax estimate to see what he should set aside.

Frequently asked questions

Does Assignment check say whether I am falsely self-employed?

No. Assignment check works through profitability and is not a legal or tax verdict. Read our checklist on false self-employment and ask for advice if in doubt.

Can I keep track of my subscriptions and hosting?

Yes. You store the invoices with the file attached as a purchase invoice. You can also record costs as an expense.

What do I need at minimum?

Assignment check, hours and the hourly rate calculator work independently of contracts. You add contracts, projects and the tax estimate when you need them.

Can I invoice by the hour or by the day?

Yes. You record hours and make the invoice from them, or you use a line with your day rate.

SmartWerk is invoicing and administration software for self-employed people, not a full accounting package and not a replacement for your bookkeeper or adviser.

All industries → All tools →

Try it with your own clients

Create a free account and start with one client. Upgrading can wait until you really need a feature.

Start for freeView pricing

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