US GDP grows at 3.4% annualised pace in Q3

The US economy grew at a 3.4% annualised rate in July to September, faster than the second quarter's 2.2%, according to the Bureau of Economic Analysis' advance GDP estimate released on October 29. A separate household report, however, showed inflation-adjusted spending barely rose in September, the quarter's final month.

Investment, consumer spending and government spending supported the quarterly expansion, while exports fell. Compared with the preceding quarter, investment accelerated and government spending turned upward. Real final sales to private domestic purchasers, which combine consumer spending with private fixed investment, rose at a 4.9% annualised rate, against 4.6% previously.

Quarterly growth does not describe every month

The 3.4% headline is not a 3.4% increase in output within three months. BEA reports the corresponding quarterly increase as 0.8%. Its annualisation method compounds a quarter's pace over four quarters to make rates easier to compare. That calculation describes the pace of change, not a prediction that the same growth will continue for a year.

In its September income and outlays release, issued the same day, BEA put real personal consumption expenditure growth at less than 0.1%. The rounded monthly table shows 0.0%, after August's 0.5%. Spending measured in current dollars increased 0.5%, but the PCE price index also rose 0.5% during September.

Real disposable personal income fell 0.3% in September after no change in August. Before adjusting for prices, disposable income increased 0.2%. The personal saving rate was 3.8%. These are aggregate national measures, rather than the circumstances of an individual family.

The September PCE price index was 3.6% above a year earlier. Excluding food and energy, the increase was 3.1%. The monthly core increase was 0.3%. Those monthly and year-on-year comparisons should not be substituted for a quarterly annualised inflation rate.

Trade and stocks provide another view of September

The Census Bureau's October 28 advance economic indicators report recorded a September goods trade deficit of $134.9 billion, up from $132.1 billion in August. Goods exports increased by $5.3 billion to $209.2 billion, while imports increased by $8.1 billion to $344.1 billion. This is a monthly goods-only measure, not the quarterly GDP trade component.

September wholesale inventories stood at $1,011.5 billion, up 0.6% from August, while retail inventories reached $885.3 billion, up 0.3%. Both inventory series are adjusted for seasonal variations and trading-day differences but not for price changes. They measure stocks at the end of the month, rather than inflation-adjusted quarterly production.

The same Census release revised August retail inventory growth to 0.3% from an initial 0.2%. August wholesale inventory growth remained 0.5%. Wholesale inventories were also 7.4% above September 2025, while retail inventories were 4.8% higher. These annual stock comparisons use the same month a year earlier, unlike the month-to-month changes reported alongside them. These are the comparisons available in the latest release; using an older preliminary August figure would mix different versions of the data.

What the advance estimate can and cannot settle

BEA's GDP guidance explains that an advance estimate uses source information that is incomplete or still subject to revision. Second and third estimates incorporate more detailed information. The next Q3 GDP estimate is scheduled for November 25, alongside corporate profits. The current number therefore records an initial assessment of a completed quarter, not a final result.

Historically, revisions have changed the initial growth reading. BEA reports an average absolute revision of 0.5 percentage points from advance to second estimates over 1996 to 2025, and 0.6 points from advance to third. Those averages are not a forecast of this quarter's revision.

GDP measures domestic production after subtracting goods and services used up in producing that output. The private domestic final-sales measure leaves out government spending, changes in private inventories and net exports. Reading both measures helps distinguish the broad output result from spending by consumers and private fixed investors without treating them as interchangeable.

The household release also updated July and August income estimates using revised employment data and newly available interest-income information. Its September snapshot and the quarterly GDP estimate answer different questions: one describes how households ended the quarter, while the other measures production across all three months.