1040 forms
Two tax seasons at once
Questions from clients about the Tax Cuts and Jobs Act dominated much of tax season -- even though most of its provisions wouldn't apply until the 2019 tax season.
PCAOB logo
New blood at the PCAOB
In January, the Public Company Accounting Oversight Board swore in a new chairman, William Duhnke, a long-time Capitol Hill staffer, and over the next few months installed an entirely new slate of board members. In June, a major staff shakeup saw the departure of chief auditor Martin Baumann, enforcement director Claudius Modesti and a number of other senior staffers. In mid-December, the board announced that a new chief auditor, Megan Zietsman, would come on board in early 2019.
IRS headquarters in Washington, D.C.
IRS headquarters in Washington, D.C.
Out on April 17
Many critical IRS systems crashed for much of Tax Day, leaving taxpayers and tax professionals unable to file for 11 hours. The systems were back up before the end of the day, but it wasn't until September that the cause was announced -- a firmware bug that led a storage array to fail; the service had missed opportunities to fix the bug months before.
Supreme Court
The U.S. Supreme Court building stands in Washington, D.C., U.S., on Friday, April 7, 2017. Judge Neil Gorsuch is poised to win an intensely political confirmation fight to join a Supreme Court already struggling to stay above politics. The Senate's expected confirmation of Gorsuch Friday will restore the generally conservative majority that existed before Justice Antonin Scalia's death last year. Photographer: Andrew Harrer/Bloomberg via Getty Images
The Wayfair decision
The Supreme Court agreed to take up South Dakota v. Wayfair in January, heard arguments in April (at which point things didn't look good for South Dakota, according to experts' interpretations of the justices' questioning), and finally ruled 5-4 in June to overturn 1992's Quill decision and allow states to require out-of-state retailers to collect sales tax.

Everyone else -- from states and retailers to accountants and tax experts -- has spent the time since figuring out how to respond ... .
Grier-Kelly-Ernst 2018
Three of the Big Four
In July, Kelly Grier (pictured) was installed at the helm of EY, meaning that three of the Big Four firms in the U.S. are now led by women. (She joined Lynne Doughtie at KPMG and Cathy Engelbert at Deloitte.)

It's a high-profile achievement, to be sure, but the profession still has a long way to go: Women represent only 22 percent of all accounting firm partners, according to the American Institute of CPAs, and a third of women in the profession reported having been sexually harassed, according to an Accounting Today/SourceMedia research study.
Melancon at 2018 Engage cropped
A new direction for audit
Developments over the course of the year pointed toward a radical change in the direction of the traditional audit service, driven by broad technology trends in general, and spearheaded by the American Institute of CPAs in particular.

In June, the institute launched its OnPoint PCR tool, aimed at improving prep, comp and review engagements, while over the year it raised upwards of $50 million from midsized accounting firms to fund the development of a transformational Dynamic Audit Solution. And throughout the year, president and CEO Barry Melancon (pictured) led the charge in proselytizing the new direction, and encouraging CPAs, accountants and auditors to disrupt themselves and get ahead of the coming changes.
House Ways and Means Committee chairman Kevin Brady, R-Texas, holds a sample postcard showing a simplified tax form as House Speaker Paul Ryan, R-Wis., looks on
Formulating new forms
Prompted by the TCJA, over the summer, the IRS released drafts of a new Form 1040 that will replace the current 1040, 1040A and 1040EZ. With the goal of creating a "postcard-sized" tax return (which should not actually be mailed like a postcard, since it clearly displays the taxypayer's Social Security number, along with other private information), the new forms move a lot of information off the old 1040 onto a series of six extra schedules.

The IRS also released a draft of a new Form W-4 for employee withholding. Pushback from groups representing tax professionals and others -- including concerns that it would require taxpayers to predict things that are difficult to anticipate, and to reveal much more personal information to employers than they had in the past -- caused the service to put off implementing the proposal for a year.
IRS Commissioner Charles "Chuck" Rettig
IRS Commissioner Charles Rettig
A new IRS commissioner (at last)
Chuck Rettig was finally installed as IRS commissioner in October, almost a year after his predecessor, John Koskinen, stepped down. Rettig was floated as a candidate in February, and confirmed by the Senate in September.

The Beverly Hills tax lawyer took the helm at an agency working flat-out to provide guidance on a host of areas surrounding the TCJA, fighting tax-related ID theft -- and struggling with diminished budgets and declining staff numbers.
Plante Moran office in Southfield, Michigan
Big deals in M&A
Amid the usual flood of M&A in the accounting space, 2018 saw an unusual number of combinations between Top 100 Firms, including Plante Moran combining with EKS&H, CliftonLarsonAllen with Schenck, Marcum with Raffa, and Baker Tilly Virchow Krause with RGL Forensics.

Acquiring firms are also becoming choosier, improving their due diligence and looking for better cultural fits and more strategic value. They’re also looking more and more beyond CPA firms: Approximately 20 percent of acquisitions by large firms involve non-accounting firms (such as technology firms and boutique consultancies).
Major departures
A number of high-profile figures announced departures: Intuit president Brad Smith said he would step down at the end of 2018, to be succeeded by executive vice president Sasan Goodarzi, while Jon Baron, the long-time leader of Thomson Reuters' services to tax and accounting professionals, named the same date for retiring, to be succeed by president of tax professionals Charlotte Rushton.

Meanwhile, Cindy Fornelli (pictured), the founding executive director of the Center for Audit Quality, announced that she would leave in the spring of 2019, and Information Technology Alliance president Stan Mork said he plans to turn over the helm in August 2019.