Richard McPhail
Chief Financial Officer & Executive Vice President at Home Depot
Thank you, Ann, and good morning, everyone. In the first quarter, total sales were $37.3 billion a decrease of approximately $1.7 billion or 4.2% from last year. During the first quarter, our total company comps were negative 4.5% with comps of negative 2.5% in February, negative 7.5% in March and negative 3.7% in April. Comps in the U.S. were negative 4.6% for the quarter with comps of negative 2.8% in February, negative 7.5% in March and negative 3.7% in April. Our first quarter comp sales missed our own expectations, particularly in the months of March and April, driven primarily by two notable factors.
First, lumber deflation drove a negative comp impact of approximately 220 basis points versus the first quarter of 2022. Second, unfavorable weather, particularly in our Western division further impacted our results. In the first quarter, our gross margin was 33.7% a decrease of 8 basis points from the first quarter last year, primarily driven by increased pressure from shrink. We continue to successfully offset supply chain and product cost pressures while maintaining our position as the customer's advocate for value.
During the first quarter, operating expense as a percent of sales increased approximately 25 basis points to 18.8% compared to the first quarter of 2022. Our operating expense performance during the first quarter reflects the planned compensation increases announced during our fourth quarter 2022 call as well as a onetime benefit from a legal settlement. Our operating margin for the first quarter was 14.9% compared to 15.2% in the first quarter of 2022. Interest and other expense for the first quarter increased by $72 million to $441 million due primarily to interest on our floating rate debt as well as higher debt balances than a year ago.
In the first quarter, our effective tax rate was 24.2%, up from 23.9% in the first quarter of fiscal 2022. Our diluted earnings per share for the first quarter was $3.82, a decrease of 6.6% compared to the first quarter of 2022. During the first quarter, we opened two new stores, bringing our total store count to 2,324. Retail selling square footage was approximately 241 million square feet. At the end of the quarter, merchandise inventories were $25.4 billion, essentially flat compared to the first quarter of 2022 and inventory turns were 3.9 times down from 4.4 times last year.
Turning to capital allocation. After investing in our business and paying our dividend, it is our intent to return excess cash to shareholders in the form of share repurchases. During the first quarter, we invested approximately $900 million back into our business in the form of capital expenditures. And during the quarter, we paid approximately $2.1 billion in dividends to our shareholders, and we returned approximately $3 billion to shareholders in the form of share repurchases. Computed on the average of beginning and ending long-term debt and equity for the trailing 12 months, return on invested capital was approximately 43.6%, down from 45.3% in the first quarter of fiscal 2022.
Now I will comment on our guidance for fiscal 2023. As you may recall, last quarter, we provided flat sales and comp guidance for fiscal 2023. As we mentioned last quarter, our guidance did not include potential impacts from lumber deflation, which we noted could negatively impact our performance for the quarter and the year. As a result, lumber negatively impacted comps by approximately 220 basis points in the first quarter. Given the negative impact of the first quarter sales from lumber and weather, further softening of demand relative to our expectations and continued uncertainty regarding consumer demand patterns, we are updating our guidance to reflect a range of potential outcomes. We now expect fiscal 2023 sales and comp sales to decline between 2% and 5%. As a result of the change in our sales outlook, we are now targeting an operating margin between 14.3% and 14.0% for the year. Our effective tax rate is targeted at approximately 24.5%. We expect interest expense of approximately $1.8 billion, and we are anticipating between a 7% and 13% decline in diluted earnings per share compared to fiscal 2022.
As Ted mentioned, we expected 2023 to be a year of moderation in the home improvement market, driven by monetary policy actions to dampen overall consumer demand. In our view, we are in a transitional period in the consumer economy. Setting the short-term impacts of monetary policy aside, we know that the home improvement customer is healthy and we believe the medium- to long-term underlying fundamentals of home improvement make it one of the most attractive markets in retail and the economy as a whole. We believe that we are well positioned to meet the needs of our customers with a broad assortment of products, strong in-stock levels and knowledgeable associates. The investments we've made in our business have enabled agility in our operating model. As we look forward, we will continue to prudently invest to strengthen our competitive position, leverage our scale and low-cost position to outperform our market and deliver shareholder value.
Thank you for your participation in today's call. And Christine, we are now ready for questions.