7 Ways to Improve the Invoicing Process

Late payments are quietly draining UK businesses. More than half of small businesses report that overdue invoices jeopardise their cash flow ¹, and processing a single invoice manually can cost anywhere from £4 to £25 ². That is money and time better spent growing your business.

This guide covers seven practical ways to improve invoicing processes, from tightening payment terms to choosing the right invoicing software. And for businesses that send or receive payments internationally, Wise Business offers a multi-currency account with batch payments, team roles, and accounting integrations that can slot right into a sharper invoicing workflow.

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Why Is Improving Invoicing Processes Important for Businesses?

A clunky invoicing process does not just slow down payments. It creates a chain reaction across the entire business.

Here are the most common pain points:

• Cash flow disruption. When invoices go out late or contain errors, payments stall. That gap between delivering work and getting paid can make it difficult to cover payroll, suppliers, or rent.
• Billing errors and disputes. Incorrect amounts, missing purchase order numbers, or wrong client details lead to back-and-forth that delays payment further. A Stampli survey found that over 54% of accounts payable professionals cited reducing errors and missed payments as their biggest challenge ³.
• Manual data entry. Keying invoice details by hand is slow and error-prone. It ties up staff who could be focused on higher-value work.
• Late payments. Without automated reminders or a clear follow-up process, overdue invoices pile up. Under UK law, a payment is considered late 30 days after the customer receives the invoice if no other date has been agreed ⁴.
• Compliance risks. Inaccurate invoices can lead to incorrect tax filings and potential penalties, especially as HMRC's Making Tax Digital requirements continue to expand.
• Damaged client relationships. Repeated errors or unclear billing erodes trust. Clients who feel confused by an invoice are less likely to pay promptly and less likely to return.

The good news: most of these problems are fixable with a few targeted changes.

7 Ways to Immediately Improve Your Invoicing Process

1. Establish clear payment terms upfront

Ambiguity around payment is one of the biggest causes of late invoices. Before any work begins, agree on the essentials in writing:

• Payment deadline (for example: Net 30, Net 14, or a specific date)
• Accepted payment methods and currencies
• Late payment penalties or early payment discounts
• Invoicing schedule (milestone-based, monthly, or on completion)

In the UK, businesses have the legal right to charge statutory interest of 8% plus the Bank of England base rate on late B2B payments ⁴. Including this in your terms gives clients a clear incentive to pay on time.

2. Send invoices promptly — and electronically

The longer you wait to invoice, the longer you wait to get paid. Send invoices as soon as work is delivered or a milestone is reached.

Electronic invoicing speeds this up considerably. Instead of printing, posting, or manually attaching PDFs to emails, invoicing software can generate and send bills in minutes. It also creates a digital trail that makes tracking and reconciliation far simpler.

For businesses with regular clients, setting up recurring invoices eliminates the need to create a new document each billing cycle.

3. Invest in the right invoicing software

Spreadsheets and manual templates work when you have a handful of clients. Beyond that, dedicated invoicing software pays for itself quickly. Look for tools that offer:

• Automated invoice generation from quotes or orders
• Recurring invoices for subscription or retainer clients
• Built-in payment reminders
• Integration with accounting platforms like Xero, QuickBooks, or FreeAgent
• Multi-currency support for international clients

A Gartner survey found that the percentage of finance functions adopting AI-powered tools more than doubled from 21% in 2023 to 58% in 2024.⁵ Even if full AI is not on your radar yet, basic automation can dramatically cut the time spent on invoicing.

Wise Business integrates with major accounting software, so invoice data and payment records sync without manual re-entry. That means fewer errors and less time reconciling at month end.

4. Offer multiple payment options

The easier you make it for clients to pay, the faster they will. Limiting customers to a single payment method, for example bank transfer only — creates unnecessary friction.

Consider offering:

• Bank transfer (including local and international options)
• Debit and credit card payments
• Direct Debit for recurring clients
• digital wallets or online payment links

For businesses with international clients, accepting payments in multiple currencies removes the burden of conversion from the customer's side. Wise Business provides local account details in major 40+ currencies, so overseas clients can pay as if the transaction were domestic — which often means faster settlement and lower costs for both parties.

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5. Automate reminders and follow-ups

Chasing payments manually is tedious and easy to let slip. Automated reminder systems send polite nudges before the due date, on the day, and at set intervals after.

This is not about being aggressive. A well-timed reminder keeps the invoice visible and gives clients a chance to flag any issues before the payment becomes overdue.

Most invoicing software includes this feature. Set it up once and let it run. If a payment remains outstanding after multiple reminders, escalate to a phone call, it is still the most effective way to resolve overdue accounts.

6. Standardise your invoice format

Consistency reduces confusion. Every invoice should include:

• Your business name, address, and contact details
• Client name and billing address
• Unique invoice number
• Clear description of goods or services
• Itemised costs, quantities, and totals
• VAT amount (where applicable)
• Payment terms and due date
• Accepted payment methods

Using a standardised template ensures nothing gets missed and makes it easier for clients' accounts payable teams to process the invoice without queries.

7. Track key metrics and review regularly

You cannot improve what you do not measure. Keep an eye on:

• Days Sales Outstanding (DSO): the average number of days it takes to collect payment. A rising DSO signals a problem.
• Invoice error rate: how often invoices need to be corrected or reissued.
• Ageing receivables: a breakdown of outstanding invoices by how long they have been overdue.

Review these metrics monthly. If DSO is creeping up, it might be time to tighten payment terms, improve your follow-up process, or switch to a tool that automates more of the workflow.

Best Practices for an Effective and Efficient Invoicing System

Beyond the core tips above, a few broader habits keep invoicing running smoothly over time:

• Audit your process regularly. At least once a quarter, review your invoicing workflow end to end. Look for bottlenecks, recurring errors, or steps that could be automated.
• Stay on top of compliance and tax requirements. VAT rules, Making Tax Digital obligations, and record-keeping requirements change. Make sure your invoicing system reflects current regulations to avoid penalties.
• Manage vendor and client relationships proactively. A quick courtesy call after sending a first invoice to a new client can prevent payment delays later. It confirms the invoice reached the right person and that all details are correct.
• Streamline international invoicing. Cross-border invoicing adds complexity , from different currencies, varying payment rails, and potential exchange rate markups. Using a multi-currency account like Wise Business can simplify this. Businesses can hold, convert, and receive funds in 40+ currencies, and access local account details in 8+. This reduces the need for intermediary transfers and the fees that come with them.

Improve your invoicing with Wise Business

A tighter invoicing process means fewer errors, faster payments, and healthier cash flow. And when international payments are part of the picture, the right account makes a real difference.

Wise Business is built for companies that work across borders. It offers the mid-market exchange rate with transparent fees shown before every transaction, so there are no surprises when paying or receiving international invoices. Businesses can hold and convert 40+ currencies, access local account details in 8+, and use batch payments to process up to 1,000 invoices in a single transfer.

It also integrates with accounting tools like Xero and QuickBooks, keeping invoice records and payment data in sync without the manual work.

Be Smart, Get Wise.

With Wise Business, you can:

• 🌍 Send money to 70+ countries and pay overseas invoices at the mid-market exchange rate with low, transparent fees and no hidden exchange rate markups (product availability varies by region)
• 📥 Receive payments in 24 currencies and counting
• 💵 Get local account details for 8+ currencies, including USD and EUR, to let your customers pay in a currency they know and trust - convenience for them and peace of mind for you
• 💰 Hold money in 40+ currencies
• 🔁 Convert currencies anytime at the mid-market exchange rate with low, transparent fees
• ⚡ Use the batch payments tool to create and send up to 1,000 payments in a single transfer
• 👥 Run payroll and make international payments for up to 1,000 employees all over the world - including paying suppliers using local payment methods like ACH, SEPA, and Faster Payments
• 💳 Get business debit cards with 0.5% cashback for you and your team to keep track of team expenses and spend all over the world, with real-time visibility and categorisation. See full cashback terms and conditions
• 🏢 Manage cash in 55+ currencies across international offices from a single business account and move money between business accounts in seconds (exact speeds can vary depending on individual circumstances and may not be the same for all transactions)
• 🧾 Connect and sync every business transaction to your favourite accounting software, including Xero, Quickbooks, and more
• 🔐 Create your own payment approvals process to manage your team better with customised access for different team members, roles and permissions
• 📑 Create custom professional invoices and schedule invoice payments for future dates
• 📈 Earn variable returns on GBP, USD and EUR with Wise Interest (Growth not guaranteed. Your balance will go down in the event of a government default or interest rates going negative.)
• 🔗 Create payment links and QR codes to get paid easily (Card payment acceptance for new Wise Business customers is currently unavailable. Payment methods subject to eligibility and availability.)
• ⚙️ Automate payouts with the Wise API (comes with 24/7 customer support, a sandbox account to test integrations, API tokens, and clear documents on how to implement and make the most of our API)

Make the wise choice when selecting a business account for your domestic and global needs.

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Growth not guaranteed. Your balance will go down in the event of a government default or interest rates going negative. Taxes may apply. Investments are offered by Wise Assets UK Ltd. (FRN 839689).

FAQs

How can I make my invoicing process more efficient?

Start by automating the repetitive parts: invoice generation, delivery, and payment reminders. Use invoicing software that integrates with your accounting platform so data flows through without manual entry. Standardise your invoice template, send bills promptly after delivering work, and offer multiple payment options to remove friction for clients.

What are the benefits of automating the invoice process?

Automation reduces manual data entry errors, speeds up invoice delivery, and ensures consistent follow-up on overdue payments. It frees up staff time for higher-value tasks and gives better visibility into accounts receivable through real-time tracking and reporting. Businesses that automate typically see shorter payment cycles and improved cash flow.

When should a business invoice a customer?

As soon as the agreed trigger occurs, whether that is delivery of goods, completion of a service, or reaching a project milestone. The sooner an invoice goes out, the sooner the payment clock starts. For ongoing relationships, set a fixed billing schedule (for example: the first of each month) so clients know when to expect it.

Disclaimer: The UK Wise Business pricing structure is changed on 26/11/2025. Receiving money, direct debits and getting paid features are not available with the Essential Plan which you can open for free. Pay a one-time set up fee of £50 to unlock Advanced features including account details to receive payments in 22+ currencies or 8+ currencies for non-swift payments. You’ll also get access to our invoice generating tool, payment links, QR codes and the ability to set up direct debits all within one account. Please check our website for the latest pricing information.

Sources used:

1. ICAEW / Federation of Small Businesses — How to Grow Cashflow: Pitfalls for Scaleups
2. How much is invoice processing costing you? | 2025
3. 50+ accounts payable statistics about AI, automation, & more
4. UK Government — Late Commercial Payments: Interest and Debt Recovery
5. Embracing AI in Finance - Gartner

Sources last checked: 18th May 2026