Keeping purchase invoices, otherwise simply known as receipts, is an integral part of the book­keep­ing process for any business, free­lancer, or household. The details of these should be recorded thor­ough­ly in chrono­log­i­cal order in prepa­ra­tion for tax returns. A purchase invoice is a type of source document – evidence of a trans­ac­tion. Don’t un­der­es­ti­mate the im­por­tance of receipts, it may seem tedious and un­nec­es­sary but holding on to documents is in­dis­pens­able. A fun­da­men­tal principle of reliable book­keep­ing is that there should be no trans­ac­tions without a receipt. This can minimise your taxable income, improve your chances of receiving a tax refund, and reduce the amount of time you need to spend on paperwork each year.

A ‘receipt’ is an umbrella term for different kinds of source documents or elec­tron­ic ref­er­ences that record trans­ac­tions, including invoices, purchase invoices, note payables, credit card slips, and salary rosters. The purpose of storing purchase invoices in this way is to document expenses and profits and record any changes in your materials. By doc­u­ment­ing every receipt, a company’s ac­tiv­i­ties are made cer­ti­fi­able, trans­par­ent, and easily com­pre­hen­si­ble, making it one of the most important aspects of company ac­count­ing.

Another defining feature of receipts is the fact that, in the in­creas­ing­ly digitised arena of ac­coun­tan­cy, they are a remnant of manual book­keep­ing. These documents are phys­i­cal­ly issued, collected, stamped, and retained for future reference. But what is the most efficient way to legally manage all these documents? This article provides a run-down of the most important things to know about book­keep­ing and handling purchase invoices and source documents.

How to manage receipts and purchase invoices

Or­gan­is­ing your documents and ref­er­ences concerns every­thing sur­round­ing the pro­duc­tion, retention, and use of receipts. While com­mer­cial law does not prescribe a par­tic­u­lar system for book­keep­ing or reg­u­lat­ing the or­gan­i­sa­tion of accounts in detail, there are nev­er­the­less a number of legal re­quire­ments and important in­for­ma­tion to keep in mind for efficient book­keep­ing.

What in­for­ma­tion should be included on a purchase invoice?

Receipts and other types of source documents can vary massively in their ap­pear­ance – for example, a run-of-the-mill receipt from a grocery store looks com­plete­ly different to a purchase invoice, and that will differ again from a salary roster. However, there are four details that should appear on every kind of receipt:

  1. Text that describes the trans­ac­tion 
  2. The amount, quantity, and/or value of any money or goods exchanged
  3. The date of the trans­ac­tion 
  4. A signature of au­tho­ri­sa­tion (this may be omitted for elec­tron­i­cal­ly generated purchase invoices)
Note

If a purchase invoice is issued digitally, it should include an authentic elec­tron­ic signature, otherwise the receipt cannot be used to claim input tax credits. If in doubt, it’s always possible to request an original receipt in paper.

If a purchase invoice is being used for a tax deduction, further in­for­ma­tion may be required. For more in­for­ma­tion on this, see the chapter on using purchase invoices for tax returns.

What are the different types of receipts?

A receipt is es­sen­tial­ly written proof of any kind of trans­ac­tion. Invoices are the most common type of receipt. These basically serve to document the demand for a fee or service. However, there is a wide variety of different types of receipts, each relating to a different kind of business trans­ac­tion, both between a company and external agents, and internal daily business within a company. That’s why it’s important to dis­tin­guish between internal financial state­ments and external financial state­ments.

External financial state­ments include all receipts obtained from external sources, such as:

  • Purchase invoices 
  • Bank state­ments
  • Bills of lading and com­mer­cial letters
  • Expense reports
  • Tax as­sess­ments
  • Com­mer­cial receipts

Internal financial state­ments, on the other hand, are handled in­ter­nal­ly within a company. These include: 

  • Wage and salary rosters 
  • Material with­draw­al slips
  • Tran­scripts of outgoing invoices 
  • Copies of receipts, com­mer­cial letters, cheques, etc.
  • Proof of can­cel­la­tions and transfers 

Where the document orig­i­nat­ed from is the deciding factor in what con­sti­tutes an external financial statement and what is an internal financial statement. For example, with online banking state­ments, even if the company prints out the statement itself, it is still an external document, as it was created and provided by an external party. Fur­ther­more, an invoice sent by mail also counts as an external document, even if it is printed in­de­pen­dent­ly.

In addition to internal and external documents, another important type of receipt is the cor­rec­tive invoice, which is used as a re­place­ment document if it’s necessary to reissue an invoice or receipt. It’s also possible to generate your own sup­port­ing documents [EN un­avail­able] here.

In order for them to be of­fi­cial­ly recog­nised, however, reissued receipts for large amounts of money should be ex­cep­tions and must not occur too fre­quent­ly in order for them to be credible. However, it is rel­a­tive­ly common to verify small amounts of change using reissued receipts – for example, tips, postage, parking fees, etc. As reissued receipts are handled in­ter­nal­ly within a company, they do not count as an internal document because they have a special status as a third type of receipt.

How do I record trans­ac­tions when book­keep­ing?

How exactly does one make an original entry of a trans­ac­tion? After col­lect­ing all these receipts, how should you file them and keep them ordered? There are some fun­da­men­tal rules to good book­keep­ing to which every business must adhere. The first rule relates to the timing of the entry; in principle, any trans­ac­tion should be doc­u­ment­ed in a timely manner. As a rule, all business trans­ac­tions and ac­com­pa­ny­ing documents should be trans­ferred to your ac­count­ing journal by the end of the month.
Fur­ther­more, you should take care to document all of your receipts without leaving any gaps. This means storing documents chrono­log­i­cal­ly and com­pre­hen­sive­ly, with con­sec­u­tive in­for­ma­tion. It is important that outsiders can clearly assign each receipt to a specific business trans­ac­tion. Ac­count­ing stamps are an ideal way to take care of leg­i­bil­i­ty, as these provide the most important in­for­ma­tion at a glance. This makes it sub­stan­tial­ly easier to file the documents correctly at the end of the month.

Many aspects of ac­count­ing are now digitised but the exact format you should use depends on your computer system. However, digital book­keep­ing systems also depend on the being correct and clear.

Providing ad­di­tion­al in­for­ma­tion

Some ad­di­tion­al in­for­ma­tion must be provided to HM Revenue and Customs. The more thorough your doc­u­men­ta­tion, the more likely it is that Revenue and Customs will class the majority of the expenses as tax de­ductible. However, different rules apply for each document type, so be sure to obtain specific ad­di­tion­al in­for­ma­tion about the re­spec­tive types of receipts when sub­mit­ting documents for the tax returns. Exercise caution here as the in­for­ma­tion required varies widely – in­ac­cu­rate documents are usually rejected by HM Revenue and Customs.

For example, for small sums, the full address of the ac­coun­tant and the tax rate (this varies depending on the state and the business category) must be added. Higher amounts, on the other hand, require more detailed in­for­ma­tion, such as the tax number of the issuer and the addresses of issuers and re­cip­i­ents.

Fur­ther­more, expense reports should always include in­for­ma­tion about the venue and staff expenses. Ad­di­tion­al in­for­ma­tion is required for hos­pi­tal­i­ty costs or expenses that might also have a personal use. For example, to claim transport expenses such as railway tickets and tax fares, you must provide in­for­ma­tion about your des­ti­na­tion. If you were unable to obtain a receipt for these, you can also provide your own documents. The financial au­thor­i­ties should then be informed in writing or at least verbally regarding the specific cir­cum­stances.

Although each receipt requires specific in­for­ma­tion and sup­port­ing documents, there is a golden rule that applies in all cases: detailed in­for­ma­tion is always far more ben­e­fi­cial than making do with minimum re­quire­ments. For example, if a receipt only lists the item iden­ti­fi­ca­tion number and price, you should add details of the purchased item. The more precise, the better; for another example, if you buy a spe­cial­ist textbook, you should note down the title of the book instead of simply writing ‘textbook’. If you submit documents that are clear, com­pre­hen­si­ble, and correctly filled in, you can also use it as evidence for your tax returns.

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