Australia's tax office cut inflated deduction claims by writing to the accountant, not the taxpayer

问题

Work-related-expense claims ran high across thousands of tax returns

背景

换别人会怎么做

The standard compliance nudge was a reminder letter sent directly to the taxpayer — a simplified explanation of the rules, a social-proof line about how most people file honestly, addressed to the person whose name appears on the return, since that person is nominally the one making the claim.

他们看到了什么

BETA and the ATO saw that for work-related-expense claims specifically, the taxpayer wasn't actually the one calculating the number — a tax agent was, often applying the same template across dozens of similar clients, which meant a letter to the taxpayer was addressed to someone with little control over the figure being questioned. Sending the letter to the agent instead, and benchmarking that agent's entire client book against comparable agents' books, put the warning in front of the person who actually set the number and gave them a reputational fact about their own professional practice to react to.

那一手

In a trial starting March 2017, the ATO sent letters not to taxpayers but to roughly 1,150 of their tax agents, informing each agent that their clients' work-related-expense claims collectively ranked among the riskiest percentage band compared with other agents' client books, and noting that the ATO's data-analytics systems flag larger-than-expected claims. No taxpayer received anything; the accountant preparing the numbers did.

为什么管用

Ranking each agent's clients' claims against other agents' client books and telling the agent their book sat in the riskiest percentage band converted an abstract compliance risk into a specific professional judgment about that agent's own conduct, which a template applied to one taxpayer's return could never do. Because a single agent's letter reached every client the agent's template touched, one letter could shift the claims of dozens of returns at once, producing $2.2 million in reduced claims and $0.9 million in additional tax paid across roughly 1,150 letters — a return that scaling to reach individual taxpayers one by one, at that ratio of effort to effect, could not plausibly match. Naming the ATO's data-analytics flagging capability gave the letter teeth beyond reputation alone, since the agent understood the claims were not just being compared but specifically monitored.

值了多少

Agents who received the letter saw their clients' claims fall by $2.2 million and tax paid rise by $0.9 million relative to a similarly sized control group of agents. The ATO projected that scaling the letter to its full at-risk agent population would cut claims by about $4.4 million and lift tax paid by about $1.7 million.

什么时候会失灵

The mechanism depends on the behaviour genuinely being produced or shaped by an identifiable intermediary rather than the end party acting independently — a taxpayer who prepares their own return without an agent's involvement wouldn't be reached by this letter at all, no matter how the deduction figure was inflated. It also depends on the intermediary having a reputation or professional stake worth protecting across a book of repeat clients; a one-off or anonymous preparer with no ongoing practice to defend would have little incentive to change behaviour based on a peer-ranking letter. And the ATO's own reporting kept this trial's $2.2 million figure distinct from a separately cited $70 million program-wide result, a reminder that a single intermediary-targeted letter is one component of a broader compliance strategy, not a complete substitute for it.

后来呢

Published by BETA as 'Improving tax compliance for income tax returns filed through tax agents,' completed August 2018, the trial is cited in tax-administration behavioral research as evidence that redirecting a compliance nudge to the intermediary who prepares the numbers can outperform nudging the end taxpayer directly. Trade press later reported the ATO's broader work-related-expense nudge messaging (of which this agent-letter trial was one strand) retained close to $70 million in revenue across 2017–18 — a larger, program-wide figure distinct from this specific trial's own $2.2 million result, cited here separately rather than merged with it.

资料来源

1. [1]Improving tax compliance: deductions for work related expenses in income tax returns filed through tax agentsBehavioural Economics Team of the Australian Government (via Wayback Machine), 2018web.archive.org
2. [2]Accountants Daily — Accounting network spots shifting behaviour towards work-related expenses claimsAccountants Daily, 2019accountantsdaily.com.au

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