A money bill is a special category of public bill defined by section 1 of the Parliament Act 1911. In UK parliamentary procedure, a money bill is a public bill which, in the opinion of the Speaker of the House of Commons, contains only provisions dealing with specified financial subjects.
These subjects include the imposition, repeal, remission, alteration or regulation of taxation, certain charges on public funds, supply, appropriation and handling of public money, and the raising or guaranteeing of loans or repayment of loans, together with subordinate matters incidental to those subjects. The Speaker of the House of Commons decides whether a bill qualifies and certifies it accordingly.
The category is constitutionally important because a certified money bill can become an Act without the consent of the House of Lords if specified conditions are satisfied. The Lords has one month in which to pass the bill without amendment, and if it does not do so, the Commons can proceed towards Royal Assent under the Parliament Act 1911. The definition is therefore technical and narrower than the everyday expression money bill might suggest.
The defining feature of a money bill is not simply that it involves money. A bill can have financial implications without qualifying as a money bill. The statutory definition requires that the bill contain only provisions dealing with the specified categories of taxation, public funds, supply, public money, loans and related subordinate matters. The word only is therefore important because additional substantive provisions can prevent certification.
The Speaker's assessment concerns the legal content of the bill rather than merely the government's explanation of its economic purpose. The definition also distinguishes national financial matters from taxation, money or loans raised by local authorities or bodies for local purposes. Consequently, a bill about a financially significant public policy does not automatically become a money bill. Certification depends upon the statutory test and parliamentary practice. Government guidance explains that Finance Bills are often, but not always, certified as money bills, and that Consolidated Fund and Appropriation Bills, now generally described through Supply and Appropriation Bills, are always certified.
The special constitutional importance of a money bill arises from the historic financial relationship between the House of Commons and the House of Lords. Section 1 of the Parliament Act 1911 provides that when a money bill has been passed by the Commons and sent to the Lords at least one month before the end of the parliamentary session, it can be presented for Royal Assent if the Lords has not passed it without amendment within one month.
The Commons can direct otherwise, but the statutory mechanism limits the Lords' ability to prevent enactment of a certified money bill. This reflects the constitutional principle that financial measures are closely connected with the elected House's control over taxation and public expenditure. Importantly, the mechanism does not mean that every financially related bill bypasses the Lords. Certification is necessary, and the bill must meet the statutory definition. The Speaker's certificate is therefore central to the operation of the special procedure.
Money bills have a specific relationship with supply bills and bills of aids and supplies, but these categories are not identical. A supply bill is a bill whose main purpose is taxation or spending and can include annual Finance Bills and Supply and Appropriation Bills. Such bills originate in the Commons and cannot be amended by the Lords because of the Commons' financial privilege.
A supply bill may nevertheless fail to qualify as a money bill under the narrower Parliament Act definition. Conversely, a bill can potentially qualify as a money bill without being a conventional bill of aids and supplies. Erskine May and parliamentary guidance emphasise that the two concepts must not be treated as synonyms. This distinction is especially important for Finance Bills. Finance Bills are supply bills, but they are not necessarily certified money bills because some Finance Bills contain provisions outside the strict statutory definition. The terms therefore describe overlapping but legally distinct classifications.
The historical origins of the modern money bill category lie in the constitutional settlement surrounding the Parliament Act 1911 and earlier conventions concerning the Commons' financial privileges. The Parliament Act was enacted after a prolonged constitutional conflict concerning the powers of the House of Lords, including its treatment of financial legislation. Section 1 created a statutory definition and procedure for money bills.
The objective was connected with the earlier convention under which the Lords did not reject or amend certain financial measures. The statutory category consequently transformed an important constitutional convention into a defined legal procedure. The definition has remained significant in modern parliamentary practice even though its precise scope can require detailed legal and procedural analysis. The Cabinet Office guidance on money bills notes that the Speaker's certification decision is made on the advice of House authorities and that reasons are not given for the decision. The historical purpose therefore remains relevant to understanding why certification carries special constitutional consequences.
The financial subjects covered by the money bill definition are broader than taxation alone. They include certain charges on the Consolidated Fund, National Loans Fund or money provided by Parliament, supply, appropriation, receipt, custody, issue or audit of public money, and raising or guaranteeing loans or repaying them. These categories reflect the major components of parliamentary control over national public finance. Taxation concerns the legal imposition or regulation of compulsory financial contributions. Supply concerns the provision of public funds.
Appropriation concerns authorising the use of money for specified purposes. Public loans concern government borrowing and related guarantees or repayment. The statutory definition also permits subordinate provisions that are incidental to these subjects. This technical breadth explains why a money bill should not be reduced to the simple idea of a bill about tax rates. It is a legally defined category covering several forms of national financial legislation.
The money bill classification also illustrates the distinction between parliamentary procedure and substantive policy. Certification does not mean that the financial policy contained in the bill is inherently of one particular type or that the bill is economically important in some general sense. It means that the Speaker considers the bill to satisfy the statutory definition. A bill can have major fiscal consequences and still not be certified if it includes provisions outside the definition.
Historical examples demonstrate that bills dealing with tax related matters have sometimes failed certification because they also contained substantive provisions outside the permitted subjects. Conversely, a measure can be certified even where its wider policy objective is not purely fiscal if its legal provisions fall within the statutory categories. The technical test therefore concerns the provisions of the bill and their relationship to the statutory definition. This is why parliamentary procedural authorities distinguish money bills from the broader group of financial or supply legislation.
A money bill is consequently best understood as a constitutionally defined category of public bill rather than as a general synonym for any bill concerning government finance. Its defining characteristics are public application, restricted financial subject matter, certification by the Speaker of the House of Commons and special treatment of the House of Lords under the Parliament Act 1911. It should be distinguished from a Finance Bill, a supply bill, a Budget and a general bill with financial consequences.
The Budget is a governmental financial statement, whereas a money bill is a parliamentary bill satisfying a statutory definition. A Finance Bill normally implements taxation proposals, whereas a money bill is determined by whether the bill falls within the Parliament Act definition. A supply bill concerns taxation or spending and can be a money bill but is not necessarily one. Understanding these distinctions prevents the common misconception that every tax or spending measure automatically receives the constitutional status of a money bill.
