How to Automate Your Accounts Payable Process

Manual accounts payable—the process of receiving, checking, approving, and paying supplier invoices—is repetitive, time-consuming, and error-prone. Every bill follows the same tedious workflow: arrives (usually in your inbox), sits there while you're busy, gets opened eventually, gets manually entered into your system, gets matched (hopefully) against the purchase order you may or may not have saved, gets approved by someone who forgot they were supposed to approve it, gets filed somewhere, and finally gets paid—usually late enough that you've lost the discount but not late enough to upset the supplier (yet). Do that fifty times a month, and you've got a process that scales like a bicycle trying to move a house. The good news: accounts payable automation exists, and it works. Automation cuts processing time per invoice from 10–15 minutes to 1–2 minutes. It nearly eliminates data-entry errors. It gets bills paid on time (and sometimes early enough to capture discounts). And—here's the bit your team will love—it frees them up to do work that actually matters instead of reading the same invoice information into two different systems.

The manual AP process is stealing your time

Let's map the traditional workflow:

Bill arrives by email or post
Someone opens it, reads it, handwrites the details into a spreadsheet or—optimistically—into your accounting system
Someone else digs through files or email to find the matching purchase order
The bill sits waiting for approval (usually on someone's desk under other papers)
Once approved, it gets filed (or sometimes misfiled)
At payment time, someone reviews outstanding invoices and creates a payment run
The payment is manually recorded in the accounting system

Each step is an opportunity for slowdown and error:

Bills languish in inboxes waiting for attention
Manual data entry introduces typos, transposed digits, wrong account codes. Across the industry, manual data entry error rates run [STAT NEEDED: industry-standard data entry error percentage]
Matching invoices to purchase orders means digging through email or a filing cabinet
Approval requests disappear or get forgotten
Filing is inconsistent, making future lookups slow
Payments get duplicated or missed, damaging supplier relationships
Until someone actually checks, you have no idea how many bills are stuck in the system

For a business processing 50 invoices per month, this workflow burns 10–15 hours monthly in pure admin work. That's not a task—that's a job.

What automated accounts payable actually does

Automation handles most of these steps electronically. For UK businesses, this is increasingly important: HMRC's Making Tax Digital for VAT now requires that VAT-registered businesses keep digital records of all invoices.

Bill capture—the OCR bit

Bills arrive by email. The software reads them using optical character recognition (OCR)—the same technology that reads cheques in a mobile banking app—and extracts the key data automatically: supplier name, invoice number, date, line items, amounts, tax, total.

No manual data entry. The system presents the extracted data for you to review and correct if needed, but the tedious bit is done.

Automatic PO matching

If you issue purchase orders (and you should—they're a basic control), the software compares the incoming invoice against the PO automatically. Quantities and prices are checked. Bills that match exactly are flagged as ready for approval. Bills with discrepancies are flagged for human review.

This sounds simple. It saves enormous time when you're processing dozens of invoices monthly.

Approval workflows that actually work

Bills route to the right approver automatically based on rules you define:

Invoices under £500? Auto-approved.
Invoices £500–£2,000? Route to the department head.
Invoices over £2,000? Route to the finance manager.
Invoices from your regular suppliers? Fast-track.
Invoices from new suppliers or unusual categories? Extra scrutiny.

Approvers get notified (email, in-app, sometimes SMS). They can approve from their phone or desktop. No chasing people. No "did you see the email I sent you three days ago?"

Payment scheduling

Approved bills are queued for payment on their due dates. The system can help you optimize timing: early enough to capture early-payment discounts, but not so early that you tie up cash unnecessarily.

Automatic bookkeeping entries

When payment is made, the accounting entries are created automatically—no duplicate entry, no manual reconciliation headaches. Your chart of accounts is updated instantly.

Audit trail

Every step—receipt, data extraction, PO matching, approval, payment—is timestamped and logged. If a bill ever gets challenged ("We never received payment"), you can pull up the entire history in seconds.

Why this matters: the real benefits

Time savings

A small business processing 50 invoices monthly saves 10–15 hours per month. For a 5-person business, that's your admin person reclaiming nearly a week of work per month. They can use it for actual finance work (like reconciling your bank accounts) instead of data entry.

Fewer mistakes

Automation eliminates 95% of manual data-entry errors. Wrong account codes, transposed supplier IDs, amounts entered wrong—these disappear. What remains are edge cases (unusual invoice formats, handwritten scrawls) that genuinely need human eyes.

Better cash management

Bills processed faster means you can pay on time (improving supplier relationships) or early (capturing discounts). For a business with 3% annual spending on invoices, a 2–3% early-payment discount is material. You'll also have clearer visibility into your business bank accounts and cash position.

Visibility

At any point, you can see:

How many bills are pending approval
Which are due for payment this week
Your total accounts payable balance
How long, on average, a bill spends in the system before payment

This visibility helps you forecast cash flow and spot bottlenecks.

Risk reduction

Automated approval workflows enforce your spending rules consistently. No bill above your threshold bypasses approval. No exceptions. This cuts fraud risk—the Association of Certified Fraud Examiners reports that billing fraud is one of the costliest forms of occupational fraud, and robust invoice controls are a key defense.

Stronger supplier relationships

Suppliers get paid on time. Lost-invoice disputes vanish. Payment disputes disappear. This strengthens your negotiating position on pricing and terms.

How to implement AP automation

Step 1: Understand your current workflow

Before automating, map where you are:

How many invoices per month?
How do they arrive (email, post, supplier portal)?
What's your average processing time from receipt to payment?
Where do things get stuck (approval bottleneck, filing, whatever)?
What errors occur most often?

Step 2: Choose the right software

AP automation is available in three flavors:

Integrated accounting software — Modern cloud accounting platforms include AP automation as a standard feature. Relentify's accounting module includes bill capture, approval workflows, and payment scheduling in the same system you use for all your other accounting. No integrations to maintain, no separate login.

Dedicated AP automation platforms — Specialized tools that bolt onto your existing accounting software. More powerful, but they add complexity and API dependencies.

Enterprise ERPs — Full suites that manage payroll, supply chain, inventory, and everything else. Overkill for a small business and priced accordingly.

For most small businesses, using the AP features built into your accounting software is the practical choice. One system, one login, no integration headaches.

Step 3: Design your approval workflow

Define:

Approval thresholds — What amount gets auto-approved? What needs a signature?
Approvers — Who approves what (by amount, supplier, category)?
Payment terms — When do bills get paid (on due date, early for discount)?
Matching rules — How strict is PO-invoice matching (3-way match, or loose)?

Step 4: Clean and migrate supplier data

Import your supplier records. For each, record:

Contact details
Payment terms
Bank details for payment
Default expense categories
Special handling notes

If your supplier data is messy (duplicates, outdated contacts, wrong addresses), clean it first. Automation amplifies messiness.

Step 5: Train your team

Automated systems still need people. Train your team on:

How to review and correct OCR-extracted data
How to handle exceptions (unusual invoice formats, complex multi-line items)
How to approve bills in the system
How to run payment batches and verify them before sending

Step 6: Pilot then expand

Start with a subset—one supplier category or one department—while keeping your manual process as a safety net. Once you trust the system, expand to all invoices.

Common mistakes to avoid

Over-automating too fast. Get the basics right first (capture, approval routing), then add matching and payment automation.

Ignoring exceptions. No system handles 100% of invoices automatically. Some will need manual intervention. Build a process for handling them instead of hoping they disappear.

Skipping supplier data cleanup. Bad data in, bad automation out.

Setting it and forgetting it. Review your AP reports regularly. Check that bills aren't stuck, that approvers are actually approving, that the error rate is dropping.

Forgetting the receipt. Record when goods or services actually arrive. This three-way match (PO, receipt, invoice) prevents you from paying for things you never received.

Frequently Asked Questions

Q: Will automation cost more than I save? A: Usually no. For a small business processing 50+ invoices monthly, the time savings alone—10–15 hours per month—pays for the tool within months. Add in error reduction and early-payment discounts, and the ROI is clear.

Q: What if we don't use purchase orders? A: You should consider them. But even without POs, AP automation saves time on bill capture, approval routing, and payment scheduling. You just skip the PO-matching step.

Q: Can we still handle invoices that come by post? A: Yes. You scan them (or your software provider scans them for you) and the OCR process extracts the data just like for email invoices.

Q: What happens if the OCR misreads something? A: The system flags it for review. You check the scanned image and correct it if needed. It's still faster than manually typing the whole invoice.

Q: Do we need to change our accounting software? A: Not necessarily. If your current software has AP automation built in, use it. If not, dedicated AP tools exist that integrate with most modern accounting packages. But integration adds complexity—many small businesses find it easier to switch to an all-in-one platform like Relentify that includes AP, invoicing, bookkeeping, and reconciliation in one place.

Q: How long does implementation take? A: Usually 2–4 weeks for a small business. Data cleanup takes the longest. The software setup is relatively fast.

Q: What if a supplier sends invoices in an unusual format? A: The system will flag it. You review it manually and either correct the OCR or enter it by hand (it still goes into the automated approval workflow). Unusual formats are rare once you've processed 50–100 invoices.

Q: Does automation work for multiple currencies or complex VAT scenarios? A: Modern platforms handle multi-currency invoices and complex VAT scenarios. The system can be configured to your specific tax rules.

Measure your success

Before and after automation, track:

Processing time per invoice — Should drop from 10–15 minutes to 1–2 minutes
Data-entry error rate — Should approach zero
Days from receipt to payment — Should decrease
Cost per invoice processed — Should decrease as manual time falls
Approval cycle time — Should drop as routing is automated
Early-payment discount capture — Should increase

Manual accounts payable does not scale. The more bills you process, the slower it gets and the more errors creep in. Automation solves this permanently. It's one of the highest-return investments a growing business can make. Start your free 14-day trial of Relentify's accounting module—including AP automation, bill capture, and payment workflows—to see the difference a unified platform can make.