Michelle Clatterbuck
Executive Vice President, Chief Financial Officer at Intuit
Thanks, Sasan. Good afternoon, everyone. For the fourth quarter of fiscal 2021, we delivered revenue of $2.6 billion; GAAP operating income of $402 million versus $483 million last year; non-GAAP operating income of $715 million versus $616 million last year; GAAP diluted earnings per share of $1.37 versus $1.68 a year ago; and non-GAAP diluted earnings per share of $1.97 versus $1.81 last year. Turning to the business segments, in the Small Business and Self-Employed Group, revenue grew 19% during the quarter and 16% in fiscal 2021. Online Ecosystem revenue grew 30% in the fourth quarter and 26% for the year.
With the aim of being the source of truth for Small Businesses, our strategic focus within Small Business and Self-Employed is threefold: grow the core, connect the ecosystem, and expand globally. First, we continue to focus on growing the core. QuickBooks Online Accounting revenue grew 28% in fiscal Q4 driven mainly by customer growth, mix shift, and higher effective prices. Second, we continue to focus on connecting the ecosystem. Online Services revenue, which includes payments, payroll, time tracking and capital, grew 35% in fiscal Q4. Within payments, revenue growth reflects ongoing customer growth along with an increase in charge volume per customer.
Within payroll, we continued to see revenue tailwinds during the quarter from growth in payroll customers and a mix shift to our full-service offering. During the quarter, we continued migrating customers to our new full-service lineup, which added approximately 5 points to Online Services growth. We're also seeing the number of employees per customer back to pre-pandemic levels. Third, our progress expanding globally added to the growth of Online Ecosystem revenue during fiscal Q4. Total international online revenue grew 47% on a constant currency basis.
We believe the best measure of the health and success of our strategy is Online Ecosystem revenue growth, which we expect to grow better than 30% over time. This is driven by 10% to 20% expected growth in both customers and ARPC. Desktop Ecosystem revenue grew 5% in the fourth quarter and 4% for the full year. QuickBooks Desktop Enterprise revenue grew mid-single digits in fiscal 2021. Consumer Group revenue grew 14% in fiscal 2021, above the high end of our longer-term expectation of 8% to 12%. Fiscal 2021 was the fourth consecutive year of double-digit revenue growth for the Consumer Group.
TurboTax units grew 6% this season. There are four primary drivers in our Consumer business. Note that these metrics exclude approximately 8 million stimulus filings last season. This data reflects the season through July 31, 2021 versus the prior season through July 31, 2020. The first is the total number of returns filed with the IRS, which we estimate will be up approximately 3% this season, higher than our prior estimate of up approximately 1%. The second is the percentage of those returns filed using do-it-yourself software. We estimate the DIY category share of total IRS returns was down slightly this season versus our prior estimate of approximately flat.
The third driver is our share. Our share of total tax returns expanded approximately 1 point to 31% this season and our share of the DIY category grew approximately 1 point. Our total share excluding Free File customers this season was approximately 29%. The fourth is average revenue per return, which increased again this season. This growth reflects the stronger contribution by TurboTax Live and mix shift to our Premier offering, which is used by investors. We estimate our retention rate rose slightly year-over-year excluding filers seeking stimulus payments last season that didn't return again this season, and we're pleased with these results.
Including these filers, we estimate total retention was down approximately 2 points. Turning to the ProConnect Group, we reported $517 million of revenue in fiscal 2021, up 5%. Moving on to Credit Karma, revenue was $405 million in Q4, another all-time high, reflecting record highs for both the core and growth verticals. Sequential growth predominantly reflects strength in credit cards and personal loans as transactions per member increased. As Sasan shared earlier, we expect pent-up demand across the core vertical to taper sometime in fiscal 2022 after a strong year of investment by our partners. We remain excited about the opportunities ahead for this platform.
Turning to our financial principles, with we remain committed to growing organic revenue double-digits and growing operating income dollars faster than revenue. As I've shared before, as we lean into our platform strategy, we see the opportunity for margin expansion over time. We take a disciplined approach to capital management, investing the cash we generate in opportunities that yield an expected return on investment greater than 15%. We continue to reallocate resources to top priorities with an emphasis on becoming an AI-driven expert platform. These principles remain our long-term commitment.
Our first priority for the cash we generate is investing in the business to drive customer and revenue growth. We consider acquisitions to accelerate our growth and fill out our product roadmap. We return excess cash that we can't invest profitably in the business to shareholders via both share repurchases and dividends. We finished the quarter with approximately $3.9 billion in cash and investments on our balance sheet. We repurchased $467 million of stock during the fourth quarter and $1 billion during fiscal 2021. The board approved a new $2 billion repurchase authorization, giving us a total authorization of approximately $3.3 billion to repurchase shares. Depending on market conditions and other factors, our aim is to be in the market each quarter.
The board approved a quarterly dividend of $0.68 per share payable October 18, 2021. This represents a 15% increase versus last year. Moving on to guidance, our full year fiscal 2022 guidance includes revenue of $11.05 billion to $11.2 billion, growth of 15% to 16%, including a full year of Credit Karma, GAAP earnings per share of $7.46 to $7.66, and non-GAAP earnings per share of $11.05 to $11.25. We expect the GAAP tax rate of 20% in fiscal 2022. Note that our revenue guidance for Credit Karma of $1.345 billion to $1.38 billion translates into 18% to 21% growth if we had a full year of Credit Karma revenue during fiscal 2021.
I'd like to provide some additional context around our operating margin expectations. As I've shared before, we continue to see opportunities to leverage the platform and drive margin expansion over time. However, our guidance implies GAAP operating margin declines just over 2 points in fiscal 2022 versus fiscal 2021. This reflects the impact of the Credit Karma acquisition, along with investments we're making in stock compensation to attract and retain talent.
We are confident these are the right decisions to drive long-term growth. On a non-GAAP basis our guidance implies operating margin in fiscal 2022 expands approximately 60 basis points. As I shared last quarter, fiscal 2021 was a very unique year as we took a conservative approach to investments during the first half of the year when we were deep in the pandemic, and then the business started to bounce back more quickly than we anticipated in the second half.
Our fiscal 2022 non-GAAP operating margin implies on average a point of expansion each year since fiscal 2019 even though our initial guidance after closing the Credit Karma acquisition included a negative 2-point non-GAAP operating margin impact. We continue to see margin expansion opportunities ahead. Our Q1 fiscal 2022 guidance includes revenue growth of 36% to 38%, GAAP earnings per share of $0.14 to $0.19, and non-GAAP earnings per share of $0.94 to $0.99. You can find our full Q1 and fiscal 2022 guidance details in our press release and on our fact sheet.
And with that, I'll turn it back over to Sasan.