Payroll and owner invoicing look like back-office work until month-end, when a vessel changes schedule or a seafarer disputes an allowance from three contracts ago. Then the cost shows up as rework, late payments and finance teams recomputing the same numbers in different spreadsheets.
Most of these problems start in the same few places. This guide walks through the seafarer payroll process step by step, from the employment agreement to the invoice your principal receives, and shows where each step usually goes wrong.
Why Seafarer Payroll Differs from Shore Payroll
Shore payroll runs on one country, one pay cycle and one employment model. Seafarer pay runs on contracts that start and end with each voyage, with rates set by rank and by the collective bargaining agreement (CBA) that covers the vessel.
One contract can also pay different rates for different stretches of time: travel to the vessel, time on board and travel home. Obligations can vary by flag, nationality and the seafarer's home country.
The owner invoice is different too. It is rarely just a price times a quantity. It combines manning fees, crew days, overtime, reimbursable costs and adjustments, and the principal expects proof behind each line.
Step 1: Contract Terms and Wage Scales
Every payroll number starts in the seafarer's employment agreement. Before anyone calculates anything, these facts need to sit in one place:
Seafarer details: identity, bank details, home address
Rank and the wage scale that applies to it, usually from a CBA or company scale
Contract dates: start, sign-on, sign-off, end, plus any extension
Pay items: basic wage, fixed overtime, leave pay, allowances and deductions
Which period each item applies to, and whether it is monthly or one-off
The currency the contract is paid in
Where it goes wrong: terms live in PDFs, allowances in email threads and rotation changes in someone's calendar. Payroll then runs fast but people spend days checking whether the inputs were right.
Step 2: Calculating Wages, Leave Pay and Overtime
Once the inputs are right, the calculation follows a few industry conventions:
Daily rate: the monthly wage divided by 30. Seafarer pay usually treats every month as 30 days.
Partial months: a seafarer who signs on or off mid-month is paid the daily rate for the days served.
Leave pay: under MLC 2006 the minimum is 2.5 days of paid leave per month of service, at the daily rate.
Overtime: the ILO and ITF reference is 1.25 times the hourly rate, with the hourly rate based on a 48-hour week. Many contracts pay a fixed monthly overtime amount instead of counting hours.
Final settlement: at sign-off, the last partial month, unpaid leave and any one-off items are closed out.
Worked example
A Second Engineer is paid on the ITF minimum wage scale for 2024: basic wage US$1,160 a month and fixed overtime of 104 hours, which comes to US$725 a month. He signs on the 12th, so he serves 19 days of a 30-day month.
| Item |
How it is calculated |
Amount, US$ |
| Daily rate |
1,160 ÷ 30 |
38.67 |
| Basic wage, 19 days |
38.67 × 19 |
734.67 |
| Fixed overtime, 19 days |
725 ÷ 30 × 19 |
459.17 |
| Leave pay, 19 days |
2.5 days × 38.67 ÷ 30 × 19 |
61.22 |
| Total for the month |
|
1,255.06 |
These are international minimums for illustration. Real contracts follow the CBA or company wage scale and often add items such as leave pay for public holidays or travel-day rates.
Where it goes wrong: pro-rating done by hand, overtime typed in as a total instead of calculated, and leave pay worked out only at sign-off, when nobody remembers the inputs.
Step 3: Currency, Allotments and Payment
Seafarers on one vessel are often paid in different currencies. A clean process records the currency per contract, takes exchange rates from a defined source at a defined time and keeps the rate used with the payslip.
Many seafarers also send an allotment, a fixed part of their wage paid directly to family at home. The employer or ship manager makes these transfers through its bank, so the payroll has to show what goes to the seafarer and what goes to the family.
Where it goes wrong: exchange rates nobody can trace later, and allotments tracked outside payroll, so the payslip and the bank transfers stop matching.
Step 4: Turning Crew Costs into the Owner Invoice
For a crewing agency, the same contract produces two amounts: the wage paid to the seafarer and the charge billed to the principal. They are rarely equal, because the principal pays manning fees and agreed rates, not the seafarer's net pay.
The invoice lines principals question most are the ones that depend on the same facts as payroll:
Billable crew days, tied to sign-on and sign-off dates
Overtime billed under agreed rules
Reimbursable costs, tied to receipts or agreed caps
Credits and adjustments after contract changes
Where it goes wrong: invoices built from a fee schedule while the disputed items sit in attachments. Each line should carry its own references: contract, vessel, dates and how the amount was calculated.
Step 5: Approvals and Audit Trail
Payroll and invoicing need controls that keep speed without losing trust:
Role-based approvals before payment
A change log for wage rates, bank details and contract dates
Dated versions of every payslip and invoice
Standard exports for auditors and principals
A simple test: how quickly can your team answer two questions? "Why is this number what it is?" and "Who approved this change, and when?"
When Dates Change Mid-Contract
Sign-on slips, a relief is delayed, a contract is extended. Every date change moves the partial-month days, the leave earned and the billable crew days on the owner invoice.
Two habits prevent most errors. Treat a sign-off date as planned until the seafarer has actually left the vessel. And when a date changes after payslips were issued, reissue them rather than patching the totals.
Seafarer Payroll FAQ
How is a seafarer's daily rate calculated? The monthly wage is divided by 30, because seafarer pay usually treats every month as 30 days. The daily rate is then used for partial months and leave pay.
What is leave pay for seafarers? Pay for the paid leave a seafarer earns while serving. MLC 2006 sets the minimum at 2.5 days per month of service, and many CBAs give more.
What is fixed overtime? A set monthly overtime amount written into the contract, instead of paying for hours counted. The ITF reference uses 104 hours a month at 1.25 times the hourly rate.
What is an allotment? A fixed part of a seafarer's wage paid directly to family at home. The employer or ship manager makes the transfer, and it is shown on the payslip.
Why does the owner invoice differ from the seafarer's wage? The principal pays manning fees and agreed rates under the crewing agreement, not the seafarer's net pay. Both amounts come from the same contract but follow different terms.
How Crewvector Handles These Steps
In Crewvector, payment terms are set once per vessel and loaded into each seafarer's contract on assignment. Each payroll line is tied to a contract period, contracts can be paid in different currencies, and payslips are built from the lines you select and exported in your own template. Invoices for the principal come from the same contract, with their own lines and rates. See how the maritime payroll software works, or how invoices for principals are built from the same data.
