quality:corruption
Chancellorship

After Lord North's ministry collapsed in 1782, the Whig Charles Watson-Wentworth, 2nd Marquess of Rockingham, was appointed prime minister. Pitt was offered the minor post of Vice-Treasurer of Ireland, but he refused, considering the post overly subordinate. Lord Rockingham died only three months after coming to power; he was succeeded by another Whig, William Petty, 2nd Earl of Shelburne. Many Whigs who had formed a part of the Rockingham ministry, including Fox, now refused to serve under Lord Shelburne, the new prime minister. Pitt, however, was comfortable with Shelburne, and thus joined his government; he was appointed Chancellor of the Exchequer.

Fox, who became Pitt's lifelong political rival, then joined a coalition with Lord North, with whom he collaborated to bring about the defeat of the Shelburne administration. When Lord Shelburne resigned in 1783, King George III, who despised Fox, offered to appoint Pitt to the office of prime minister. But Pitt wisely declined, for he knew he would be incapable of securing the support of the House of Commons. The Fox–North coalition rose to power in a government nominally headed by William Cavendish-Bentinck, 3rd Duke of Portland.

Pitt, who had been stripped of his post as Chancellor of the Exchequer, joined the Opposition. He raised the issue of parliamentary reform in order to strain the uneasy Fox–North coalition, which included both supporters and detractors of reform. He did not advocate an expansion of the electoral franchise, but he did seek to address bribery and rotten boroughs. Though his proposal failed, many reformers in Parliament came to regard him as their leader, instead of Charles James Fox.