Quotes and invoices, without the software
Getting paid is its own job. You did the work, and now you need to put a number
in front of the customer, send a bill they will actually pay, and have a plan for
when they do not. This page walks you through that “get paid” path and points
you to five free tools that do the math: a quote before the work, an
invoice after it, a late fee when a bill goes past due, a spreadsheet
invoice template for the operator who bills the same way every time, and a
monthly payment figure when a whole season goes on one contract.
Most “free” invoice and quote makers online are not really free. They let you
fill in a form, then ask for your email, or a full account, before they will
hand over the PDF. These tools do not. You fill them in, you print or save the
PDF, and nothing you type leaves your browser. No signup, no email wall, no
upsell.
A quick map before you start:
These are planning and document tools, not legal or tax advice. The numbers are
estimates you control, so always check them against your own contract and your
state’s rules before you send anything.
Quote vs. estimate vs. invoice: which one do you send?
People use these three words loosely, and it costs them. Here is the plain
version.
- A quote is a firm price you promise before the work. “This job is $850,
good through the end of the month.” Once the customer says yes, you are
generally on the hook for that number, so a quote usually carries an
expiration date.
- An estimate is your best guess before the work, not a promise. “Probably
$700 to $900, depending on what we find.” Estimates flex; quotes do not. In
practice many small operators send a document labeled “Quote” that behaves
like an estimate, and that is fine, as long as the customer understands which
one it is.
- An invoice is the bill you send after the work (or for a deposit), asking
to be paid. It carries a due date and payment terms, and it is the document
that actually moves money.
For which document actually binds you, including the state-specific wrinkles
this quick version skips, see the
estimate vs quote vs bid guide. The
practical rule here: send a quote or estimate to win the job, then send an
invoice to get paid for it. The Quote Generator
is built for the first document: it adds an issue date and an “expires on” date
so your price does not haunt you six months later. The
Invoice Template Generator is
built for the second: it adds a due date, payment terms, and a running balance.
Both tools share the same line-item engine, so the price you quoted carries the
same math when it becomes an invoice. That is the point of doing them in one
place.
How the line-item total is actually built
Whether it is a quote or an invoice, the total is built the same way, one layer
at a time. Knowing the order matters, because moving the steps around changes
what the customer owes.
- Line subtotal. Each row is
quantity × unit price. Three hours at $75 is
$225; 4,000 square feet at $0.02 is $80. The tools add up every row to get a
subtotal.
- Discount. A discount comes off the subtotal. You can take it as a percent
(“10% off”) or a flat dollar amount (“$50 off”). A flat discount is capped at
the subtotal, so the bill can never go below zero.
- Tax. Sales tax is usually applied to the amount after the discount, the
discounted taxable base, not the original subtotal. This is the common
convention, and it is the one these tools use. If you discount $500 down to
$450 and your tax rate is 7%, you are taxed on $450, not $500.
- Total. Total = discounted subtotal + tax. (If you work in a tax-inclusive
region, the tools can instead pull the tax back out of a tax-included
price, but the US default is tax shown as a separate line on top.)
Two more choices the tools expose:
- Aggregate vs. per-line. By default, one discount and one tax rate apply to
the whole document (the US norm). If you have mixed items, some taxable and
some not, or work across tax jurisdictions, you can switch to per-line tax and
discount instead.
- Tax rate is yours to set. There is no “correct” sales-tax rate baked in;
rates vary by state, county, and even what you are selling. Look up your own
rate and enter it.
None of this is tax advice. It is just the arithmetic, shown so you can check
it. If you are unsure whether a service is taxable in your state, your state
department of revenue is the authority.
An invoice is a quote plus a few fields that exist to move money on time:
- Due date and payment terms. “Net 30” means payment is due 30 days after
the invoice date; Net 15 and Net 60 work the same way, and “due on receipt”
(Net 0) means now. The Invoice Template Generator
lets you pick a term and it sets the due date for you, or you can set the due
date by hand.
- Balance due. If the customer already paid a deposit or part of the bill,
the balance due is simply the total minus what they have paid. The tool tracks
unpaid, partial, and paid states and shows the remaining balance.
- Payment methods. A plain line telling them how to pay (check, Zelle, ACH,
card) removes the most common reason an invoice sits unpaid: the customer did
not know how.
- An optional late-fee note. The invoice tool can preview a late fee so the
customer sees, up front, what happens if they pay late. A fee you disclosed on
the invoice is far easier to actually charge than one you spring afterward.
Shorter terms get you paid faster, but push too hard and you lose the job to a
competitor who gave 30 days. Net 30 is the common default for trade work; pick
the term that fits your cash flow and your customer.
When the invoice goes unpaid: the late fee, done honestly
A late fee does two things: it nudges customers to pay on time, and it
compensates you a little for the money you are owed but cannot use yet. The
Invoice Late Fee Calculator computes it
with the most common, easiest-to-defend method: simple daily interest.
Here is exactly how it figures the number:
- Days overdue. It counts the days from the due date to the payment date,
then subtracts your grace period. A grace period is a no-penalty cushion
of, say, 5 or 10 days before the fee starts. If the bill is paid within the
grace window, the fee is zero.
- The daily interest. It takes your annual rate, divides by 365 to get a
daily rate, and multiplies by the invoice amount and the days overdue:
invoice × (annual rate ÷ 365) × days overdue. The tool defaults to 18% a
year, which is the same as 1.5% a month, a common small-business late-fee
rate. You can also enter the rate as a monthly percentage and it converts for
you.
- Optional flat fee. Some businesses add a fixed charge on top, say $25,
the moment a bill is late. The tool can add that to the interest.
- New total due. Total = the original invoice + the late fee.
A worked example: a $1,000 invoice, 18% a year, no flat fee, 10 days late after
the grace period. The daily rate is 18% ÷ 365 ≈ 0.0493% a day. Ten days of that
on $1,000 is about $4.93, for a new total of about $1,004.93. Late fees
are usually small in dollar terms. Their real power is the reminder, not the
revenue.
Two limits you have to respect (this is not legal advice)
This is the part the cheap online calculators skip, and it is the part that can
get you in trouble:
- Your state may cap the rate. There is no single federal limit on what you
can charge, and most states set no statutory maximum at all, but a handful do
cap late fees outright, written as a monthly percentage. The calculator shows a
quiet warning if your rate goes above 18% a year, because 1 to 1.5 percent a
month (12 to 18 percent a year) is the common small-business convention, but it
does not know your state’s actual law. Check your state’s rules before you
rely on a high rate.
- You usually have to disclose the fee first. As a general matter, a late
fee is far more enforceable when it was written into the contract or estimate
the customer agreed to, and stated on the invoice, not invented after the
bill is overdue. Put your late-fee policy in writing before the work, not
after.
These tools are planning aids, not legal advice, and they do not know your
contract or your state’s law. For the rules that apply to you, see your written
agreement with the customer and your state’s guidance. The U.S. Small Business
Administration and your state attorney general’s office publish plain-language
explanations of small-business billing and consumer-protection rules.
Run them as one workflow:
- Quote the job. Build a priced, dated quote in the
Quote Generator, set an expiration
date, print or save the PDF, and send it. Win the job.
- Invoice the finished work. Move the same line items into the
Invoice Template Generator,
set Net 30 (or your term), add how you take payment, and send the bill.
- Add a fair late fee, only if needed. If the invoice goes past due and
your contract allowed it, figure the exact, defensible amount in the
Invoice Late Fee Calculator, then
send a polite follow-up with the new total. The
Past Due Invoice Letter Template
writes that follow-up in the browser in three escalating stages: a friendly
reminder, a second notice on the late fee terms you already agreed, and a
final notice that sets a date.
Two members sit slightly outside that three-step loop. If you would rather keep
your billing in a spreadsheet you own, the
Service Invoice Template is the
same invoice as an Excel file, with labor and parts in separate sections, a
per-line taxable flag, and totals that add themselves up. And when the customer
buys a whole season rather than a single visit, the
Annual Contract Monthly Payment Calculator
turns the year’s visits and add-ons into one equal monthly payment with a
printable 12-month schedule, so the bill you send every month is the same number
the contract promised.
Before any of this, the price itself has to be right. If you are not sure your
number covers your labor, overhead, and a real margin, work that out first with
the job pricing tools. This hub assumes
you already know what to charge and just need to put it on paper and get paid.
Billing documents are one family of a larger set. The agreements that govern the
job, the work orders and field forms that record it, and the checklists and logs
you reuse on every stop all live in the
templates and forms library.
These are estimates and document templates, not financial, tax, or legal
advice. The math is shown so you can check it; the rules that apply to your
business are set by your contract and your state, not by this page.