An error-free invoice is an important re­quire­ment for busi­nesses who want to avoid legal conflicts with customers or the HMRC. Invoices are subject to strict reg­u­la­tion in the UK, and there are special reg­u­la­tions that must be applied when preparing a VAT invoice as well. We explain which com­pon­ents an invoice should include and which ad­di­tion­al re­quire­ments there are for the issuance of a correct invoice.

What is on an invoice?: Invoice re­quire­ments

An invoice is a written document where the supplier lists the goods and/or services provided in detail and requests payment from the customer. An invoice is different than a receipt, which is just an ac­know­ledge­ment of the payment – the money claim on the one hand and product liability are binding even without one. But legally speaking, it is required to have clear doc­u­ment­a­tion of any claims you may want to make, and if both you and your business partner are VAT-re­gistered busi­nesses then you must meet those invoice re­quire­ments as well. For a com­mer­cial document to be legally re­cog­nised as an invoice in the United Kingdom, the following mandatory spe­cific­a­tions are made by the HMRC. The document must contain the following:

Unique iden­ti­fic­a­tion number
Name and address of both seller and recipient, as well as the date of sale
Detailed de­scrip­tion of the mer­chand­ise
Supply date of goods or services
Price of each item of mer­chand­ise
All ad­di­tion­al charges on the mer­chand­ise (shipping, insurance, etc.)
VAT amount (if ap­plic­able)
Total amount owed

If both you and your business partner are VAT-re­gistered busi­nesses, then the invoice needs to meet VAT re­quire­ments. In addition to the regular invoice re­quire­ments, these include: VAT number
Tax point (time of supply)
Price per item (excluding VAT)
Total amount excluding VAT
Total VAT amount
Item quantity and discount rate (if ap­plic­able)
VAT rate charged per item
Total amount including VAT

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Delivery or service date

Here is where you list the date on which the delivery was received by the customer or the service was performed. For service per­form­ance dates, it’s pretty decisive - simply list the date when the service was completed. For the delivery date, you can either specify the date from the delivery note or write the expected date if the exact time hasn’t been de­term­ined yet (e.g. ‘expected delivery: 12.5.2017’).

Invoice number

Numbering your invoices is the best way to keep track of your records and avoid any issues with missing doc­u­ment­a­tion. There are multiple methods of doing this, but all employ a sequence of con­sec­ut­ive numbers. The unique invoice number is used to clearly identify the invoice. Com­bin­a­tions of number and letters are also possible, as is including the date of service or customer number.

Example

You can start your con­sec­ut­ive invoice number sequence wherever you want to. For example:

Invoice number: D-230517-P-4602

In this number, the D stands for domestic, 230517 is the invoice date (23 May 2017), and P stands for a delivery warehouse in Ports­mouth. The 4602 is the con­sec­ut­ive invoice number, meaning that the next invoice would need to use the suffix 4603.

You can also form invoice numbers without any letters, such as the following example:

23052017-4602-00

In this case, the number starts with the date (23 May 2017), the 4602 is the customer number, and the 00 suffix denotes the first invoice of that par­tic­u­lar customer’s sequence. The next invoice for customer 4602 would have to end with 01.

Quantity and type of deliver or scope and type of service

Make sure that you include all delivered goods or all billed services in­di­vidu­ally and with a com­mer­cial de­scrip­tion in the invoice. That way, you can simply use col­lect­ive terms like “Office furniture”, “Tableware”, “Drain­pipes”, etc. But terms that are too general, such as “Gift items”, aren’t suf­fi­cient descriptors. In the same line, enter the prices (total price and price per unit, if ap­plic­able).

Note

If pre­pay­ments have been cal­cu­lated, then you need to specify this sep­ar­ately on the invoice with the addition “Billing for service yet to be rendered”. If you already know the date that the payment will be made, you need to include this as well

Charges, tax, and tax rate

The charges (net and gross invoice), the tax amount (price plus VAT), and the tax rate (VAT rate in percent) must be listed in­di­vidu­ally in the invoice. If the customer receives a tax exemption, then the invoice also needs to indicate which delivery or service the exemption applies to. This also goes for any other re­duc­tions such as discounts, bonuses, etc.

Tax reg­u­la­tions for small busi­nesses

The HMRC allows self-employed people to register as a sole trader, which must be included on the invoice. Your taxes as a sole trader are then filed via a self as­sess­ment tax return. Tax ex­emp­tions, returns, and payroll reg­u­la­tions are points of concern when running your own business and still at­tempt­ing to meet tax ob­lig­a­tions.  Cor­por­a­tion Tax is self-assessed, but only paid by limited companies. VAT tax also must be tracked if your small business sells products and services. Income tax must be paid once profit goes above the personal tax allowance of £11,500 (2017). This is tracked by the HMRC according to the PAYE (Pay As You Earn) method.

Invoice re­cord­keep­ing

As with any kind of re­cord­keep­ing, it’s re­com­men­ded to hold onto any tax-related records for as long as they are ap­plic­able – if the expenses have yet to be filed or have just recently been filed, it’s a good idea to hold onto any paperwork. That way, if questions of proof arise, you will have them for reference. If you’re running a limited company, the HMRC requires records to be kept for 6 years, and you risk fines of up to £3,000 or dis­qual­i­fic­a­tion as company director if you fail to keep proper records.

Special rules for invoicing

As it so often goes, there are ex­cep­tions when it comes to invoicing. Special cases include credit items, advance payments or partial services, as well as travel expenses. There are also special rules for invoicing outside of the UK.

Credit instead of bill

Credit is issued by the recipient. This doesn’t settle an invoice in the classic sense, where payment is collected, but instead the service provider receives a credit in the amount of the agreed price for the service rendered.

Tip

If a freel­an­cer is working for a company for a par­tic­u­lar amount of time, they can relieve them­selves of bur­eau­crat­ic expenses by not issuing an invoice for their work. Instead, they receive a credit from the company as their fee.

Here, VAT is added just like a regular invoice. The credit issued is treated just as a cash payment would be. It’s important that you identify the credit as such for the taxation au­thor­it­ies.

Advance payments and partial services

In general, invoices don’t have to be paid in advance. Customers are fre­quently given the option to divide services and pay in in­stall­ments. For you as the company, it’s important that you record payments that have already been made in the final statement. Partial services must also be properly taxed.

Note

Use the same tax rate re­gard­less of the amount of service being billed. Partial invoices are applied in the same way as complete ones.

Travel expenses in the invoice

Whether by train or plane or bus, travel expenses can also be submitted as invoices. These are dealt with as tax ex­emp­tions by the HMRC and include the following: Travel between home and business des­tin­a­tion
Fares for taxis or other trans­port­a­tion between locations (e.g. airport, hotel, work location, etc.)
shipping of baggage or material between locations
Meals and lodging
Dry cleaning and laundry
Business calls while on business trip
Other expenses related to business travel

Note

Keeping good records is essential for suc­cess­fully claiming any business-related travel expense de­duc­tions.

Invoicing outside the UK

When doing business with entities outside of the UK, it’s important to check the rules and reg­u­la­tions of the country you’re doing business with to make sure both you and your business partner are in com­pli­ance. When doing business with partners in the EU, for example, including your company’s VAT iden­ti­fic­a­tion number is an essential component of the invoice. But with business outside of the EU, VAT isn’t charged. Check the HMRC reg­u­la­tions for business abroad as well as the reg­u­la­tions of the specific country or countries with which you are doing business.

Common errors with invoice creation

Invoicing has the potential to be ab­so­lutely riddled with errors. By sub­mit­ting an incorrect or in­com­plete invoice with your taxes, you might be denied the right to deduct and be stuck with extra costs. These are the most common mistake that happen while invoicing that you should be sure to avoid:

Required in­form­a­tion is missing or in­cor­rectly entered

If you don’t take account of the re­quire­ments mentioned above when creating your invoice, then you won’t fulfill the minimum re­quire­ments and your invoices will not be accepted for taxation. De­duc­tions aren’t issued if the necessary data is not complete and correct on the invoice. Small typing errors generally won’t deny your right to deduct, as long as they aren’t on important in­form­a­tion. But in­cor­rectly listing the tax iden­ti­fic­a­tion number can lead to sig­ni­fic­ant problems.

Incorrect VAT rate applied

If you specify a VAT rate that’s either too high or too low, this is a serious billing error. Always make sure that the correct in­form­a­tion has been entered here. If, for example, you issue a tax rate that’s too high, you’ll have to pay that rate to the tax office. Your customer, though, can’t put the excessive tax rate toward their deduction. But a tax rate that is too low also has con­sequences. It’s true that the company applying the tax will only have to pay that rate on their product, but it also means that the recipient can only deduct at the specified rate.

Un­au­thor­ised tax credit

Invoices that contain false data are referred to as un­au­thor­ised tax credits. If, for example, you list the expense as office im­prove­ments but instead buy a game console for your own use instead of an office computer, the extra tax must be paid. Details on types of un­au­thor­ised payments and sub­sequent tax charges are listed by the HMRC.

Invalid invoices

If an invoice has been drawn up without any services actually being performed or de­liv­er­ies taking place, it’s called a bill. Bills are also available if the invoice issuer isn’t actually a business. In such cases, the HMRC reserves the right to refuse the invoice recipient’s request for de­duc­tions.

Tip

Always check your invoices! It is the best way to ensure that you only submit complete, compliant invoices with your taxes. This goes for paper invoices as well as elec­tron­ic version.

Please note the legal dis­claim­er relating to this article.

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