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Operator
Good morning, and thank you for joining us for Marine Products Corporation's Third Quarter 2020 Financial Earnings Conference Call. Today's call will be hosted by Rick Hubbell, President and CEO; and Ben Palmer, Chief Financial Officer. Also present is Jim Landers, Vice President of Corporate Services.
(Operator Instructions) I would like to advise everyone that this conference call is being recorded. Jim will get us started by reading the forward-looking disclaimer.
James Landers
Thank you, and good morning. Before we get started today, I'd like to remind everyone that some of the statements that we will make on this call may be forward-looking in nature and reflect a number of known and unknown risks. I'd like to refer you to our press release issued today, our 2019 10-K and other SEC filings that outline those risks. All of these are available on our website at marineproductscorp.com. If you've not received our press release and would like to see it, please visit our website, again, at marineproductscorp.com for a copy.
We will make a few comments about the quarter and then we'll be available for your questions. Now I will turn the call over to our President and CEO, Rick Hubbell.
Richard A. Hubbell - President, CEO & Director
All right, Jim, thanks. We issued our earnings press release for the third quarter of 2020 this morning. Ben Palmer, our CFO, will discuss the financial results in more detail in a moment.
But before I summarize the quarter, I'd like to take a moment to recognize R. Randall Rollins, our Chairman, who passed away during the third quarter following a short illness. Randall held his position at Marine Products and its predecessor since 1986. He was proud of our company's success and reputation for quality, and we will miss him.
Now on to our discussion of Marine Products' third quarter results. We completed a full quarter of production and sales following our temporary operational suspension during the second quarter due to concerns over the COVID-19 pandemic. In contrast to other years at this point in the boating season, we have a very high dealer order backlog, most of which has been sold in retail; and low dealer inventories. For these reasons, we are continuing to operate at the highest feasible operational levels as we enter the third quarter.
Recreational boating sales continue to benefit from the effects of COVID -- of the COVID pandemic, which is restricting vacation travel and recreational activities in crowded environments, forcing individuals and households to remain isolated. As a result of this extraordinary situation, we are seeing the highest dealer and consumer demands we have seen in years.
As we review our market share at the end of the third quarter, I am pleased to report that Chaparral continues to be a market share leader in its sterndrive recreational boat category. Robalo also continues to be a market share leader in the outboard category. And the combination of Chaparral and Robalo outboard models continue to hold the highest outboard boat market share in their size category.
We announced this morning that our Board of Directors yesterday declared a regular quarterly cash dividend of $0.08 per share plus a special year-end cash dividend of $0.04 per share. The Board of Directors continues to believe that both the dividend level and the special year-end dividend represent a prudent and tangible way to reward our shareholders.
With that overview, I'd like to turn it over to our CFO, Ben Palmer.
Ben M. Palmer - VP, CFO, Treasurer & Corporate Secretary
Thank you, Rick. Net sales for the third quarter of 2020 were $68.8 million, a 4.8% decrease compared to the third quarter of last year. Unit sales declined by 10.4% as compared to the third quarter of last year. This decline was partially offset by an improved model mix, which resulted in increased average selling prices of 7.8%.
Gross profit in the third quarter was $16.2 million, an increase of 3.1% compared to the third quarter of '19. Gross margin during the quarter was 23.6% compared to 21.8% in the third quarter of 2019. Gross margin as a percentage of net sales increased due to an improved model mix yielding average selling prices -- higher average selling prices during the quarter when compared to the prior year.
Selling, general and administrative expenses were $7.9 million in the third quarter of 2020, an increase of $1.9 million compared to $6 million in the third quarter of last year. These expenses were higher due to a state research and development payroll tax credit that was $1.2 million lower during the third quarter of 2020 as compared to the prior year as well as $963,000 in deferred compensation expense associated with the accelerated vesting of restricted stock due to the death of our company's chairman. These expenses were 11.5% of net sales in the third quarter of 2020 compared to 8.4% of net sales in the third quarter of '19.
For the quarter ended September 30, 2020, we reported net income of $6.5 million, a decrease of 16.8% compared to net income of $7.9 million in the third quarter of '19. Diluted earnings per share were $0.19 in the third quarter of 2020 compared to $0.23 in the prior year. Our effective tax rate this quarter was 21.8% compared to 19.8% in the prior year.
Our international sales decreased by 29.9% and accounted for only 3.1% of total sales during the quarter compared to 4.3% of total sales in the third quarter of 2019. Our international sales decreased in all of our international markets. Cash balance at the end of the third quarter was $29 million, an increase of $6 million compared to $23 million at the end of the third quarter of 2019.
As Rick mentioned, dealer inventory levels were significantly lower at the end of the third quarter of 2020 than at the end of the second quarter of 2020 or the third quarter of last year. Our order backlog in units was higher than it has been in many years. We believe that our retail sales have increased in line with industry growth during the first 3 quarters of 2020 because of the reduction in dealer inventories. In spite of the fact that traditional retail selling season has ended, our dealers still report, again, low field inventories and are eager to restock their inventory.
With that, I'll turn it back over to Rick for a few closing remarks.
Richard A. Hubbell - President, CEO & Director
Thank you, Ben. We approach the 2021 model year and the winter boat show seasons with a great deal of optimism and are evaluating opportunities to increase production levels to satisfy near-term demand levels. However, our interest in increasing production at this time was tempered by manufacturing capacity constraints, labor availability and supply chain concerns. We are also uncertain about the feasibility of in-person boat shows and are working closely with our dealers to plan for alternate means to market our 2021 products to dealers and consumers. In spite of these concerns, we are very happy to be operating in a high demand market with quality brands and a dominant market share.
I'd like to thank you for joining us this morning, and we'll be happy to take any questions you may have.
Operator
(Operator Instructions) And we have no questions in queue. I'll turn the call back over to Jim Landers for closing remarks.
James Landers
Okay. Thank you. And we know some people have called in to listen, so we appreciate you calling in to listen. Please let us know if you have any questions, and I hope everybody has a good day. Thanks.
Operator
Ladies and gentlemen, thank you for participating. The conference call will be replayed on marineproductscorp.com within 2 hours following the completion of the call. You may now disconnect.