Marina Billing Software: Automate Slip, Storage & Recurring Invoices

Every marina runs on the same quiet rhythm: slips and storage get billed, customers pay, and the money that does not arrive on time slowly piles up in a folder somewhere. The marinas that do this well are not working harder. They have just stopped doing the parts that a computer should be doing, and the obvious candidate is recurring billing.

This guide is about marina billing software specifically: the system that generates invoices, charges cards, and tracks who owes what. We will walk through what it actually has to handle at a working marina, how billing differs from accounting (they are not the same thing, and you almost certainly need both), and where the real products land. If you want the ledger side instead, start with our companion piece on marina accounting software.

#What marina billing software actually has to do

Strip away the marketing and billing software has one job: turn what a customer owes into an invoice, collect on it, and keep score. At a marina, that simple job has a lot of edges. You are not billing one flat subscription. You are billing a 32-foot slip annually, a dry-stack space monthly, a transient by the night, electric by the meter, and a haul-out as a one-off, sometimes all to the same customer.

Here is the work a marina billing system needs to absorb so your front desk does not have to.

• Recurring slip and storage billing on whatever cycle the contract uses: annual, seasonal, quarterly, or monthly.
• Prorations when a boat arrives mid-period or leaves early, so you are not eyeballing partial months.
• Metered electric and utilities, billed from actual readings instead of a guess that is always a little wrong.
• Deposits and prepayments held against a contract and applied correctly when the real invoice lands.
• One-off charges: pump-outs, haul-outs, labor, parts, and anything that runs through the yard.
• Payments by card on file, ACH, check, or cash, posted against the right invoice.
• Accounts receivable with an aging view so the 60- and 90-day balances are not a surprise.
• Late fees applied by rule, and statements that summarize a customer's full balance.

#Billing vs. accounting: why marinas run both

This trips up a lot of operators evaluating software, so it is worth being precise. Billing and accounting solve adjacent problems and they are not interchangeable.

#Billing is the front of the house

Billing software generates the invoice, presents it to the customer, takes the payment, and tracks the receivable. It answers operational questions: Who has been invoiced for the season? Whose card failed? Which contracts are past due? It lives close to your slips, your contracts, and your customers, because that is where the charges originate.

#Accounting is the back of the house

Accounting software is your ledger. It records every transaction into accounts, handles the chart of accounts, reconciles the bank, and produces the financial statements your owner, bank, or accountant actually reads, the P&L and balance sheet. It answers financial questions, not operational ones. Tools like QuickBooks and Xero live here.

Could one tool do both? Some suites try. But many marinas deliberately keep a purpose-built billing front end and a dedicated accounting back end, because the billing tool understands marina contracts and the accounting tool understands accountants. If you are weighing whether to collapse your stack, the trade-offs are laid out in our piece on consolidating disconnected marina tools.

#The features that separate good billing from a spreadsheet

Plenty of marinas run on a spreadsheet plus a card terminal and survive. The question is how much of your week that survival costs. These are the capabilities that move billing from a chore into something that runs mostly on its own.

1. 1Recurring schedules. Set the cycle once per contract and let invoices generate themselves. The spring re-bill done by hand, every slip, every year, is the single biggest time sink billing software removes.
2. 2Proration logic built in. Mid-period arrivals and early departures should compute automatically. Doing this math by hand is slow and it is where small revenue errors creep in.
3. 3Card on file and off-session charging. A stored payment method means renewals and recurring invoices can charge without chasing the customer for a card every cycle.
4. 4A real aging report. You want to see 30/60/90 buckets at a glance, because A/R that quietly ages to 90 days is revenue you have already earned and not yet collected.
5. 5Rule-based late fees. Apply them consistently and automatically, so the policy is enforced by the system rather than by whoever remembers.
6. 6Clean statements and an accounting sync. A customer should get one clear summary of their balance, and your books should update without manual entry.

Payments deserve their own note, because billing is only half the loop. The card processing rates and flow you choose directly affect what you keep, and we go deep on that in marina credit card processing in 2026. Marine OS uses Stripe for checkout and for off-session charges when a payment method is already on file, which you can read more about on our Stripe integration page.

#The real options, compared neutrally

The market sorts into a few camps. None of these is the right answer for everyone, so the useful exercise is matching the tool's center of gravity to your operation.

#All-in-one operations suites

Storable offers marina billing alongside point of sale, and DockMaster is a long-established marina and boatyard suite that bundles billing with service and inventory. The appeal is one vendor across many functions. The trade-off is that breadth can mean you adopt a lot of system to get the billing you wanted. If DockMaster is on your shortlist, we have a side-by-side on the DockMaster comparison page.

#Reservation-first platforms

Dockwa and Molo come at the marina from the booking and reservation side, with billing attached to that flow. These shine for transient-heavy operations where the reservation is the primary event. For a marina dominated by long-term annual and seasonal contracts, recurring billing depth matters more than booking polish.

#Billing-focused, contract-aware tools

Marine OS sits here. The focus is the billing loop for a contract-driven marina: recurring schedules, prorations, metered charges, payments, and A/R, tied directly to your slip management and built to connect to your accounting rather than replace it. It is in early access with marina operators today, so the honest framing is a focused tool growing with its users, not a decade-old suite.

#How Marine OS approaches recurring billing

A quick, honest look at the mechanics, since this is what you are evaluating. Marine OS models billing as three connected pieces: a BillingSchedule defines the recurring cycle for a contract, an Invoice is generated from it, and a Payment is posted against that invoice. The piece operators tend to like is that a recurring schedule can preview the due dates and amounts before any invoice is actually generated, so you confirm the run before it goes out rather than discovering a mistake after.

Payments run through Stripe checkout, and when a customer already has a payment method on file, Marine OS can charge off-session for recurring invoices. Data is yours to take: there is CSV export across the system. And because billing should not be an island, it is designed to connect to accounting tools in the catalog like QuickBooks and Xero, so posted revenue and payments can flow to your books. We describe that integration depth cautiously because early access means it is actively maturing, but the architecture is built around connecting to your ledger, not becoming it.

Every marina contract is a little different, which is why the billing model is meant to flex. If your slip mix or seasonal rules are unusual, our note on customizable marina software covers how that flexibility works in practice.

#What automating billing actually changes

The practical wins are not abstract. When recurring billing is automated, the spring re-bill stops eating a week. When charges hit a card on file, your collection rate improves simply because fewer invoices wait on a customer to dig out a card. When late fees apply by rule, your A/R stops aging silently. And when billing connects cleanly to one customer record, you stop hunting across systems to answer a simple question about who owes what, which is the whole idea behind a unified customer record.

It also changes how you price your own time. If you are still calculating whether the software is worth it, the realistic budgeting math is in how much marina software costs.

#Pricing, plainly

Marine OS uses flat plans rather than per-transaction billing surprises: Solo at $199, Crew at $599, Fleet at $1,499, and custom pricing for Chains. There is a 7-day free trial with no credit card required, so you can run a real billing cycle before committing. Full details are on the pricing page.

#Frequently asked questions

If your slips, storage, and yard work all bill a little differently, that is normal, and it is exactly what a contract-aware billing system is for. To see whether Marine OS fits how your marina actually invoices, start with a demo or read more on the marina solutions overview.